Remove Contact header from BYE and CANCEL requests.

Per rfc3261 the Contact header is not applicable and MUST not appear in
the request.

FS-5868 #resolve

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -465,6 +465,7 @@ switch_status_t sofia_on_hangup(switch_core_session_t *session)
 			switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Sending BYE to %s\n", switch_channel_get_name(channel));
 			if (!sofia_test_flag(tech_pvt, TFLAG_BYE)) {
 				nua_bye(tech_pvt->nh,
+						SIPTAG_CONTACT(SIP_NONE),
 						TAG_IF(!zstr(reason), SIPTAG_REASON_STR(reason)),
 						TAG_IF(call_info, SIPTAG_CALL_INFO_STR(call_info)),
 						TAG_IF(!zstr(tech_pvt->user_via), SIPTAG_VIA_STR(tech_pvt->user_via)),
@@ -478,6 +479,7 @@ switch_status_t sofia_on_hangup(switch_core_session_t *session)
 				}
 				if (!sofia_test_flag(tech_pvt, TFLAG_BYE)) {
 					nua_cancel(tech_pvt->nh,
+							   SIPTAG_CONTACT(SIP_NONE),
 							   TAG_IF(call_info, SIPTAG_CALL_INFO_STR(call_info)),
 							   TAG_IF(!zstr(reason), SIPTAG_REASON_STR(reason)), TAG_IF(!zstr(bye_headers), SIPTAG_HEADER_STR(bye_headers)), TAG_END());
 				}

src/mod/endpoints/mod_sofia/sofia.c

@@ -7750,6 +7750,7 @@ void sofia_handle_sip_i_refer(nua_t *nua, sofia_profile_t *profile, nua_handle_t
 										q850 = switch_core_session_sprintf(a_session, "Q.850;cause=16;text=\"normal_clearing\"");
 									}
 									nua_bye(b_tech_pvt->nh,
+											SIPTAG_CONTACT(SIP_NONE),
 											TAG_IF(!zstr(q850), SIPTAG_REASON_STR(q850)),
 											TAG_IF(!zstr(tech_pvt->user_via), SIPTAG_VIA_STR(tech_pvt->user_via)), TAG_END());
 

src/mod/endpoints/mod_sofia/sofia_reg.c

@@ -2483,7 +2483,7 @@ void sofia_reg_handle_sip_r_challenge(int status,
 	if (session) {
 		switch_channel_hangup(switch_core_session_get_channel(session), SWITCH_CAUSE_MANDATORY_IE_MISSING);
 	} else {
-		nua_cancel(nh, TAG_END());
+		nua_cancel(nh, SIPTAG_CONTACT(SIP_NONE), TAG_END());
 	}
 
   end: