ATT Cell callers calling in do not hear a ring, Net provider tells me we need to remove the SDP profile from the 183 Session Progress , where and how do I do that, have not found the 183 Session Progress area.
ATT Cell callers calling in do not hear a ring, Net provider tells me we need to remove the SDP profile from the 183 Session Progress , where and how do I do that, have not found the 183 Session Progress area.