Thank you, I will try : action application="bridge" data="{media_webrtc=false}sofia/.... ------------------ Original ------------------ From: "james";<freepbx@qq.com>; Date: Tue, Aug 23, 2016 05:00 PM To: "freeswitch-users"<freeswitch-users@lists.freeswitch.org>; Subject: Compatibility issues with Error Cause: 88 [INCOMPATIBLE_DESTINATION] Hello: I am using portsip webRTC gateway to test the compatibility. I use two phones for webRTC testing. One is normal webRTC client and another one is softphone. FreeSWITCH work as a IPPBX. The call flows are: the problem is that webRTC calls sip phone without any problem, but sip phone calls to webRTC than failed. errors are: 2016-08-23 16:29:39.971775 [DEBUG] switch_core_state_machine.c:569 (sofia/internal/pu7ai86t@9t5jv2hi82a5.invalid) State Change CS_REPORTING -> CS_DESTROY freeswitch@iZ23lkvsnwpZ> 2016-08-23 16:29:39.971775 [DEBUG] switch_core_session.c:1647 Session 171 (sofia/internal/pu7ai86t@9t5jv2hi82a5.invalid) Locked, Waiting on external entities freeswitch@iZ23lkvsnwpZ> 2016-08-23 16:29:39.981772 [DEBUG] switch_ivr_originate.c:3759 Originate Resulted in Error Cause: 88 [INCOMPATIBLE_DESTINATION] freeswitch@iZ23lkvsnwpZ> 2016-08-23 16:29:39.981772 [NOTICE] switch_ivr_originate.c:2771 Cannot create outgoing channel of type [user] cause: [INCOMPATIBLE_DESTINATION] freeswitch@iZ23lkvsnwpZ> 2016-08-23 16:29:39.981772 [DEBUG] switch_ivr_originate.c:3759 Originate Resulted in Error Cause: 88 [INCOMPATIBLE_DESTINATION] freeswitch@iZ23lkvsnwpZ> 2016-08-23 16:29:39.981772 [INFO] mod_dptools.c:3401 Originate Failed. Cause: INCOMPATIBLE_DESTINATION freeswitch@iZ23lkvsnwpZ> EXECUTE sofia/internal/1004@120.26.130.142 answer() ------------------------- It looks freeswitch send with ICE to webRTC. Does anyone know how i do disable the webRTC negotiation and only send normal sip info to webRTC gateway