diff --git a/coreapi/linphonecore.c b/coreapi/linphonecore.c
index d669975c6..5d0ea9b27 100644
--- a/coreapi/linphonecore.c
+++ b/coreapi/linphonecore.c
@@ -1303,6 +1303,7 @@ static void sip_config_read(LinphoneCore *lc) {
 
 	lc->sal->use_no_initial_route(!!lp_config_get_int(lc->config,"sip","use_no_initial_route",0));
 	lc->sal->use_rport(!!lp_config_get_int(lc->config,"sip","use_rport",1));
+	lc->sal->set_contact_linphone_specs(lp_config_get_string(lc->config, "sip", "linphone_specs", NULL));
 
 	if (!lp_config_get_int(lc->config,"sip","ipv6_migration_done",FALSE) && lp_config_has_entry(lc->config,"sip","use_ipv6")) {
 		lp_config_clean_entry(lc->config,"sip","use_ipv6");
diff --git a/src/sal/op.cpp b/src/sal/op.cpp
index 262c53d5e..8d8cb286b 100644
--- a/src/sal/op.cpp
+++ b/src/sal/op.cpp
@@ -784,8 +784,10 @@ belle_sip_header_contact_t *SalOp::create_contact() {
 			}
 		}
 	}
-	if (belle_sip_parameters_has_parameter(BELLE_SIP_PARAMETERS(contact_header),"+org.linphone.specs")==0){
-		belle_sip_parameters_set_parameter(BELLE_SIP_PARAMETERS(contact_header),"+org.linphone.specs","groupchat");
+	if (this->root->linphone_specs && strlen(this->root->linphone_specs) > 0) {
+		if (belle_sip_parameters_has_parameter(BELLE_SIP_PARAMETERS(contact_header),"+org.linphone.specs") == 0) {
+			belle_sip_parameters_set_parameter(BELLE_SIP_PARAMETERS(contact_header), "+org.linphone.specs", this->root->linphone_specs);
+		}
 	}
 	return contact_header;
 }
diff --git a/src/sal/sal.cpp b/src/sal/sal.cpp
index 974796253..c87b5e95c 100644
--- a/src/sal/sal.cpp
+++ b/src/sal/sal.cpp
@@ -395,6 +395,7 @@ Sal::~Sal() {
 	if (this->uuid) ms_free(this->uuid);
 	if (this->root_ca) ms_free(this->root_ca);
 	if (this->root_ca_data) ms_free(this->root_ca_data);
+	if (this->linphone_specs) ms_free(this->linphone_specs);
 }
 
 void Sal::set_callbacks(const Callbacks *cbs) {
@@ -672,6 +673,16 @@ void Sal::use_rport(bool_t use_rports) {
 	ms_message("Sal use rport [%s]", use_rports ? "enabled" : "disabled");
 }
 
+void Sal::set_contact_linphone_specs(const char *specs) {
+	if (this->linphone_specs) {
+		ms_free(this->linphone_specs);
+		this->linphone_specs = NULL;
+	}
+	if (specs) {
+		this->linphone_specs = ms_strdup(specs);
+	}
+}
+
 void Sal::set_root_ca(const char* rootCa) {
 	if (this->root_ca) {
 		ms_free(this->root_ca);
diff --git a/src/sal/sal.h b/src/sal/sal.h
index eece42388..46b1a453e 100644
--- a/src/sal/sal.h
+++ b/src/sal/sal.h
@@ -170,6 +170,7 @@ public:
 
 	bctbx_list_t *get_pending_auths() const {return bctbx_list_copy(this->pending_auths);}
 
+	void set_contact_linphone_specs(const char *specs);
 
 	/**********************/
 	/* Network parameters */
@@ -305,6 +306,7 @@ private:
 	bool_t pending_trans_checking = TRUE; /*testing purpose*/
 	void *ssl_config = NULL;
 	bctbx_list_t *supported_content_types = NULL; /* list of char* */
+	char *linphone_specs = NULL;
 
 	friend class SalOp;
 	friend class SalCallOp;