diff --git a/flexiapi/app/Http/Controllers/Account/RegisterController.php b/flexiapi/app/Http/Controllers/Account/RegisterController.php
index a9ef57c..fb23b82 100644
--- a/flexiapi/app/Http/Controllers/Account/RegisterController.php
+++ b/flexiapi/app/Http/Controllers/Account/RegisterController.php
@@ -34,6 +34,7 @@ use App\Helpers\Utils;
 use App\Libraries\OvhSMS;
 use App\Mail\RegisterConfirmation;
 use App\Mail\NewsletterRegistration;
+use App\Rules\NoUppercase;
 
 class RegisterController extends Controller
 {
@@ -69,6 +70,7 @@ class RegisterController extends Controller
             'privacy' => 'accepted',
             'username' => [
                 'required',
+                new NoUppercase,
                 Rule::unique('accounts', 'username')->where(function ($query) use ($request) {
                     $query->where('domain', config('app.sip_domain'));
                 }),
@@ -113,6 +115,7 @@ class RegisterController extends Controller
             'terms' =>'accepted',
             'privacy' => 'accepted',
             'username' => [
+                new NoUppercase,
                 Rule::unique('accounts', 'username')->where(function ($query) use ($request) {
                     $query->where('domain', config('app.sip_domain'));
                 }),
diff --git a/flexiapi/app/Http/Controllers/Api/AccountController.php b/flexiapi/app/Http/Controllers/Api/AccountController.php
index e54e587..9ff6b9e 100644
--- a/flexiapi/app/Http/Controllers/Api/AccountController.php
+++ b/flexiapi/app/Http/Controllers/Api/AccountController.php
@@ -30,6 +30,7 @@ use App\Account;
 use App\AccountTombstone;
 use App\Token;
 use App\Http\Controllers\Account\AuthenticateController as WebAuthenticateController;
+use App\Rules\NoUppercase;
 
 class AccountController extends Controller
 {
@@ -51,6 +52,7 @@ class AccountController extends Controller
         $request->validate([
             'username' => [
                 'required',
+                new NoUppercase,
                 Rule::unique('accounts', 'username')->where(function ($query) use ($request) {
                     $query->where('domain', $request->has('domain') && config('app.everyone_is_admin')
                                                 ? $request->get('domain')
diff --git a/flexiapi/app/Rules/NoUppercase.php b/flexiapi/app/Rules/NoUppercase.php
new file mode 100644
index 0000000..057ceba
--- /dev/null
+++ b/flexiapi/app/Rules/NoUppercase.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Rules;
+
+use Illuminate\Contracts\Validation\Rule;
+
+class NoUppercase implements Rule
+{
+    public function passes($attribute, $value)
+    {
+        return strtolower($value) == $value;
+    }
+
+    public function message()
+    {
+        return 'No uppercase letters are allowed.';
+    }
+}
diff --git a/flexiapi/composer.lock b/flexiapi/composer.lock
index 425b899..c047123 100644
--- a/flexiapi/composer.lock
+++ b/flexiapi/composer.lock
@@ -536,16 +536,16 @@
         },
         {
             "name": "endroid/qr-code",
-            "version": "4.3.0",
+            "version": "4.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/endroid/qr-code.git",
-                "reference": "98f6d4024289ad3a8d7f3e63cab947ef6929dcdb"
+                "reference": "5630e192948b466d418608ecce697465d20260af"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/endroid/qr-code/zipball/98f6d4024289ad3a8d7f3e63cab947ef6929dcdb",
-                "reference": "98f6d4024289ad3a8d7f3e63cab947ef6929dcdb",
+                "url": "https://api.github.com/repos/endroid/qr-code/zipball/5630e192948b466d418608ecce697465d20260af",
+                "reference": "5630e192948b466d418608ecce697465d20260af",
                 "shasum": ""
             },
             "require": {
@@ -596,7 +596,7 @@
             ],
             "support": {
                 "issues": "https://github.com/endroid/qr-code/issues",
-                "source": "https://github.com/endroid/qr-code/tree/4.3.0"
+                "source": "https://github.com/endroid/qr-code/tree/4.3.5"
             },
             "funding": [
                 {
@@ -604,7 +604,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2021-08-28T12:29:40+00:00"
+            "time": "2021-09-17T07:50:43+00:00"
         },
         {
             "name": "erusev/parsedown",
@@ -978,16 +978,16 @@
         },
         {
             "name": "laravel/framework",
-            "version": "v8.60.0",
+            "version": "v8.62.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/laravel/framework.git",
-                "reference": "44f16a31a1d4ac8a51605550d7796e2273984a48"
+                "reference": "60a7e00488167ce2babf3a2aeb3677e48aaf39be"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/framework/zipball/44f16a31a1d4ac8a51605550d7796e2273984a48",
-                "reference": "44f16a31a1d4ac8a51605550d7796e2273984a48",
+                "url": "https://api.github.com/repos/laravel/framework/zipball/60a7e00488167ce2babf3a2aeb3677e48aaf39be",
+                "reference": "60a7e00488167ce2babf3a2aeb3677e48aaf39be",
                 "shasum": ""
             },
             "require": {
@@ -997,15 +997,17 @@
                 "ext-json": "*",
                 "ext-mbstring": "*",
                 "ext-openssl": "*",
-                "league/commonmark": "^1.3|^2.0",
+                "laravel/serializable-closure": "^1.0",
+                "league/commonmark": "^1.3|^2.0.2",
                 "league/flysystem": "^1.1",
                 "monolog/monolog": "^2.0",
                 "nesbot/carbon": "^2.31",
                 "opis/closure": "^3.6",
                 "php": "^7.3|^8.0",
                 "psr/container": "^1.0",
+                "psr/log": "^1.0 || ^2.0",
                 "psr/simple-cache": "^1.0",
-                "ramsey/uuid": "^4.0",
+                "ramsey/uuid": "^4.2.2",
                 "swiftmailer/swiftmailer": "^6.0",
                 "symfony/console": "^5.1.4",
                 "symfony/error-handler": "^5.1.4",
@@ -1024,7 +1026,8 @@
                 "tightenco/collect": "<5.5.33"
             },
             "provide": {
-                "psr/container-implementation": "1.0"
+                "psr/container-implementation": "1.0",
+                "psr/simple-cache-implementation": "1.0"
             },
             "replace": {
                 "illuminate/auth": "self.version",
@@ -1061,21 +1064,21 @@
             },
             "require-dev": {
                 "aws/aws-sdk-php": "^3.189.0",
-                "doctrine/dbal": "^2.6|^3.0",
+                "doctrine/dbal": "^2.13.3|^3.1.2",
                 "filp/whoops": "^2.8",
                 "guzzlehttp/guzzle": "^6.5.5|^7.0.1",
                 "league/flysystem-cached-adapter": "^1.0",
-                "mockery/mockery": "^1.4.2",
+                "mockery/mockery": "^1.4.4",
                 "orchestra/testbench-core": "^6.23",
                 "pda/pheanstalk": "^4.0",
-                "phpunit/phpunit": "^8.5.8|^9.3.3",
+                "phpunit/phpunit": "^8.5.19|^9.5.8",
                 "predis/predis": "^1.1.2",
                 "symfony/cache": "^5.1.4"
             },
             "suggest": {
                 "aws/aws-sdk-php": "Required to use the SQS queue driver, DynamoDb failed job storage and SES mail driver (^3.189.0).",
                 "brianium/paratest": "Required to run tests in parallel (^6.0).",
-                "doctrine/dbal": "Required to rename columns and drop SQLite columns (^2.6|^3.0).",
+                "doctrine/dbal": "Required to rename columns and drop SQLite columns (^2.13.3|^3.1.2).",
                 "ext-ftp": "Required to use the Flysystem FTP driver.",
                 "ext-gd": "Required to use Illuminate\\Http\\Testing\\FileFactory::image().",
                 "ext-memcached": "Required to use the memcache cache driver.",
@@ -1089,10 +1092,10 @@
                 "league/flysystem-aws-s3-v3": "Required to use the Flysystem S3 driver (^1.0).",
                 "league/flysystem-cached-adapter": "Required to use the Flysystem cache (^1.0).",
                 "league/flysystem-sftp": "Required to use the Flysystem SFTP driver (^1.0).",
-                "mockery/mockery": "Required to use mocking (^1.4.2).",
+                "mockery/mockery": "Required to use mocking (^1.4.4).",
                 "nyholm/psr7": "Required to use PSR-7 bridging features (^1.2).",
                 "pda/pheanstalk": "Required to use the beanstalk queue driver (^4.0).",
-                "phpunit/phpunit": "Required to use assertions and run tests (^8.5.8|^9.3.3).",
+                "phpunit/phpunit": "Required to use assertions and run tests (^8.5.19|^9.5.8).",
                 "predis/predis": "Required to use the predis connector (^1.1.2).",
                 "psr/http-message": "Required to allow Storage::put to accept a StreamInterface (^1.0).",
                 "pusher/pusher-php-server": "Required to use the Pusher broadcast driver (^4.0|^5.0|^6.0).",
@@ -1142,20 +1145,79 @@
                 "issues": "https://github.com/laravel/framework/issues",
                 "source": "https://github.com/laravel/framework"
             },
-            "time": "2021-09-08T13:37:21+00:00"
+            "time": "2021-09-28T13:30:25+00:00"
         },
         {
-            "name": "laravel/tinker",
-            "version": "v2.6.1",
+            "name": "laravel/serializable-closure",
+            "version": "v1.0.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/laravel/tinker.git",
-                "reference": "04ad32c1a3328081097a181875733fa51f402083"
+                "url": "https://github.com/laravel/serializable-closure.git",
+                "reference": "679e24d36ff8b9be0e36f5222244ec8602e18867"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/laravel/tinker/zipball/04ad32c1a3328081097a181875733fa51f402083",
-                "reference": "04ad32c1a3328081097a181875733fa51f402083",
+                "url": "https://api.github.com/repos/laravel/serializable-closure/zipball/679e24d36ff8b9be0e36f5222244ec8602e18867",
+                "reference": "679e24d36ff8b9be0e36f5222244ec8602e18867",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.3|^8.0"
+            },
+            "require-dev": {
+                "pestphp/pest": "^1.18",
+                "phpstan/phpstan": "^0.12.98",
+                "symfony/var-dumper": "^5.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Laravel\\SerializableClosure\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Taylor Otwell",
+                    "email": "taylor@laravel.com"
+                },
+                {
+                    "name": "Nuno Maduro",
+                    "email": "nuno@laravel.com"
+                }
+            ],
+            "description": "Laravel Serializable Closure provides an easy and secure way to serialize closures in PHP.",
+            "keywords": [
+                "closure",
+                "laravel",
+                "serializable"
+            ],
+            "support": {
+                "issues": "https://github.com/laravel/serializable-closure/issues",
+                "source": "https://github.com/laravel/serializable-closure"
+            },
+            "time": "2021-09-29T13:25:52+00:00"
+        },
+        {
+            "name": "laravel/tinker",
+            "version": "v2.6.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/laravel/tinker.git",
+                "reference": "c808a7227f97ecfd9219fbf913bad842ea854ddc"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/laravel/tinker/zipball/c808a7227f97ecfd9219fbf913bad842ea854ddc",
+                "reference": "c808a7227f97ecfd9219fbf913bad842ea854ddc",
                 "shasum": ""
             },
             "require": {
@@ -1208,9 +1270,9 @@
             ],
             "support": {
                 "issues": "https://github.com/laravel/tinker/issues",
-                "source": "https://github.com/laravel/tinker/tree/v2.6.1"
+                "source": "https://github.com/laravel/tinker/tree/v2.6.2"
             },
-            "time": "2021-03-02T16:53:12+00:00"
+            "time": "2021-09-28T15:47:34+00:00"
         },
         {
             "name": "laravelcollective/html",
@@ -1481,16 +1543,16 @@
         },
         {
             "name": "league/mime-type-detection",
-            "version": "1.7.0",
+            "version": "1.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/mime-type-detection.git",
-                "reference": "3b9dff8aaf7323590c1d2e443db701eb1f9aa0d3"
+                "reference": "b38b25d7b372e9fddb00335400467b223349fd7e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/mime-type-detection/zipball/3b9dff8aaf7323590c1d2e443db701eb1f9aa0d3",
-                "reference": "3b9dff8aaf7323590c1d2e443db701eb1f9aa0d3",
+                "url": "https://api.github.com/repos/thephpleague/mime-type-detection/zipball/b38b25d7b372e9fddb00335400467b223349fd7e",
+                "reference": "b38b25d7b372e9fddb00335400467b223349fd7e",
                 "shasum": ""
             },
             "require": {
@@ -1521,7 +1583,7 @@
             "description": "Mime-type detection for Flysystem",
             "support": {
                 "issues": "https://github.com/thephpleague/mime-type-detection/issues",
-                "source": "https://github.com/thephpleague/mime-type-detection/tree/1.7.0"
+                "source": "https://github.com/thephpleague/mime-type-detection/tree/1.8.0"
             },
             "funding": [
                 {
@@ -1533,28 +1595,28 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-01-18T20:58:21+00:00"
+            "time": "2021-09-25T08:23:19+00:00"
         },
         {
             "name": "monolog/monolog",
-            "version": "2.3.2",
+            "version": "2.3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "71312564759a7db5b789296369c1a264efc43aad"
+                "reference": "fd4380d6fc37626e2f799f29d91195040137eba9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/71312564759a7db5b789296369c1a264efc43aad",
-                "reference": "71312564759a7db5b789296369c1a264efc43aad",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/fd4380d6fc37626e2f799f29d91195040137eba9",
+                "reference": "fd4380d6fc37626e2f799f29d91195040137eba9",
                 "shasum": ""
             },
             "require": {
                 "php": ">=7.2",
-                "psr/log": "^1.0.1"
+                "psr/log": "^1.0.1 || ^2.0 || ^3.0"
             },
             "provide": {
-                "psr/log-implementation": "1.0.0"
+                "psr/log-implementation": "1.0.0 || 2.0.0 || 3.0.0"
             },
             "require-dev": {
                 "aws/aws-sdk-php": "^2.4.9 || ^3.0",
@@ -1562,14 +1624,14 @@
                 "elasticsearch/elasticsearch": "^7",
                 "graylog2/gelf-php": "^1.4.2",
                 "mongodb/mongodb": "^1.8",
-                "php-amqplib/php-amqplib": "~2.4",
+                "php-amqplib/php-amqplib": "~2.4 || ^3",
                 "php-console/php-console": "^3.1.3",
                 "phpspec/prophecy": "^1.6.1",
                 "phpstan/phpstan": "^0.12.91",
                 "phpunit/phpunit": "^8.5",
                 "predis/predis": "^1.1",
                 "rollbar/rollbar": "^1.3",
-                "ruflin/elastica": ">=0.90 <7.0.1",
+                "ruflin/elastica": ">=0.90@dev",
                 "swiftmailer/swiftmailer": "^5.3|^6.0"
             },
             "suggest": {
@@ -1577,8 +1639,11 @@
                 "doctrine/couchdb": "Allow sending log messages to a CouchDB server",
                 "elasticsearch/elasticsearch": "Allow sending log messages to an Elasticsearch server via official client",
                 "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
+                "ext-curl": "Required to send log messages using the IFTTTHandler, the LogglyHandler, the SendGridHandler, the SlackWebhookHandler or the TelegramBotHandler",
                 "ext-mbstring": "Allow to work properly with unicode symbols",
                 "ext-mongodb": "Allow sending log messages to a MongoDB server (via driver)",
+                "ext-openssl": "Required to send log messages using SSL",
+                "ext-sockets": "Allow sending log messages to a Syslog server (via UDP driver)",
                 "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
                 "mongodb/mongodb": "Allow sending log messages to a MongoDB server (via library)",
                 "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
@@ -1617,7 +1682,7 @@
             ],
             "support": {
                 "issues": "https://github.com/Seldaek/monolog/issues",
-                "source": "https://github.com/Seldaek/monolog/tree/2.3.2"
+                "source": "https://github.com/Seldaek/monolog/tree/2.3.5"
             },
             "funding": [
                 {
@@ -1629,7 +1694,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-07-23T07:42:52+00:00"
+            "time": "2021-10-01T21:08:31+00:00"
         },
         {
             "name": "nesbot/carbon",
@@ -1727,16 +1792,16 @@
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.12.0",
+            "version": "v4.13.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "6608f01670c3cc5079e18c1dab1104e002579143"
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/6608f01670c3cc5079e18c1dab1104e002579143",
-                "reference": "6608f01670c3cc5079e18c1dab1104e002579143",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/50953a2691a922aa1769461637869a0a2faa3f53",
+                "reference": "50953a2691a922aa1769461637869a0a2faa3f53",
                 "shasum": ""
             },
             "require": {
@@ -1777,9 +1842,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v4.12.0"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.13.0"
             },
-            "time": "2021-07-21T10:44:31+00:00"
+            "time": "2021-09-20T12:20:58+00:00"
         },
         {
             "name": "opis/closure",
@@ -2468,24 +2533,25 @@
         },
         {
             "name": "ramsey/uuid",
-            "version": "4.2.1",
+            "version": "4.2.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ramsey/uuid.git",
-                "reference": "fe665a03df4f056aa65af552a96e1976df8c8dae"
+                "reference": "fc9bb7fb5388691fd7373cd44dcb4d63bbcf24df"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ramsey/uuid/zipball/fe665a03df4f056aa65af552a96e1976df8c8dae",
-                "reference": "fe665a03df4f056aa65af552a96e1976df8c8dae",
+                "url": "https://api.github.com/repos/ramsey/uuid/zipball/fc9bb7fb5388691fd7373cd44dcb4d63bbcf24df",
+                "reference": "fc9bb7fb5388691fd7373cd44dcb4d63bbcf24df",
                 "shasum": ""
             },
             "require": {
                 "brick/math": "^0.8 || ^0.9",
                 "ext-json": "*",
-                "php": "^7.2 || ^8",
+                "php": "^7.2 || ^8.0",
                 "ramsey/collection": "^1.0",
-                "symfony/polyfill-ctype": "^1.8"
+                "symfony/polyfill-ctype": "^1.8",
+                "symfony/polyfill-php80": "^1.14"
             },
             "replace": {
                 "rhumsaa/uuid": "self.version"
@@ -2549,7 +2615,7 @@
             ],
             "support": {
                 "issues": "https://github.com/ramsey/uuid/issues",
-                "source": "https://github.com/ramsey/uuid/tree/4.2.1"
+                "source": "https://github.com/ramsey/uuid/tree/4.2.3"
             },
             "funding": [
                 {
@@ -2561,7 +2627,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-08-11T01:06:55+00:00"
+            "time": "2021-09-25T23:10:38+00:00"
         },
         {
             "name": "swiftmailer/swiftmailer",
@@ -3317,16 +3383,16 @@
         },
         {
             "name": "symfony/http-kernel",
-            "version": "v5.3.7",
+            "version": "v5.3.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-kernel.git",
-                "reference": "a3a78e37935a527b50376c22ac1cec35b57fe787"
+                "reference": "ceaf46a992f60e90645e7279825a830f733a17c5"
             },
             "dist": {
                 "type": "zip",
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             ],
-            "abandoned": true,
             "time": "2020-09-28T06:45:17+00:00"
         },
         {
@@ -7692,16 +7755,16 @@
         },
         {
             "name": "symfony/debug",
-            "version": "v4.4.27",
+            "version": "v4.4.31",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/debug.git",
-                "reference": "2f9160e92eb64c95da7368c867b663a8e34e980c"
+                "reference": "43ede438d4cb52cd589ae5dc070e9323866ba8e0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/2f9160e92eb64c95da7368c867b663a8e34e980c",
-                "reference": "2f9160e92eb64c95da7368c867b663a8e34e980c",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/43ede438d4cb52cd589ae5dc070e9323866ba8e0",
+                "reference": "43ede438d4cb52cd589ae5dc070e9323866ba8e0",
                 "shasum": ""
             },
             "require": {
@@ -7740,7 +7803,7 @@
             "description": "Provides tools to ease debugging PHP code",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/debug/tree/v4.4.27"
+                "source": "https://github.com/symfony/debug/tree/v4.4.31"
             },
             "funding": [
                 {
@@ -7756,7 +7819,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2021-07-22T07:21:39+00:00"
+            "time": "2021-09-24T13:30:14+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/flexiapi/resources/views/account/register/email.blade.php b/flexiapi/resources/views/account/register/email.blade.php
index bd01bdd..8a32f80 100644
--- a/flexiapi/resources/views/account/register/email.blade.php
+++ b/flexiapi/resources/views/account/register/email.blade.php
@@ -10,12 +10,13 @@
 
 <div class="form-group">
     {!! Form::label('username', 'SIP Username') !!}
-    <div class=" input-group mb-3">
+    <div class=" input-group">
         {!! Form::text('username', old('username'), ['class' => 'form-control', 'placeholder' => 'username', 'required']) !!}
         <div class="input-group-append">
             <span class="input-group-text" id="basic-addon2">{{ $domain }}</span>
         </div>
     </div>
+    <small class="form-text text-muted mb-3">Capital letters are not allowed</small>
 </div>
 
 <hr />
diff --git a/flexiapi/resources/views/account/register/phone.blade.php b/flexiapi/resources/views/account/register/phone.blade.php
index 6041b30..6ab960b 100644
--- a/flexiapi/resources/views/account/register/phone.blade.php
+++ b/flexiapi/resources/views/account/register/phone.blade.php
@@ -15,12 +15,13 @@
 
 <div class="form-group">
     {!! Form::label('username', 'SIP Username (optional)') !!}
-    <div class=" input-group mb-3">
+    <div class=" input-group">
         {!! Form::text('username', old('username'), ['class' => 'form-control', 'placeholder' => 'username']) !!}
         <div class="input-group-append">
             <span class="input-group-text" id="basic-addon2">{{ $domain }}</span>
         </div>
     </div>
+    <small class="form-text text-muted mb-3">Capital letters are not allowed</small>
 </div>
 
 @include('parts.terms')
diff --git a/flexisip-account-manager.spec b/flexisip-account-manager.spec
index fc163ca..77647df 100644
--- a/flexisip-account-manager.spec
+++ b/flexisip-account-manager.spec
@@ -8,7 +8,7 @@
 #%define _datadir           %{_datarootdir}
 #%define _docdir            %{_datadir}/doc
 
-%define build_number 104
+%define build_number 105
 %define var_dir /var/opt/belledonne-communications
 %define opt_dir /opt/belledonne-communications/share/flexisip-account-manager