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When Huawei IP phone make a call, the call cannot be established to Cisco Ip phone.
this case is using an AR150 router as a PBX.
eSpce 7900 series Ip phone: V200R002
Capture packets at both sides and the result was Ip phone Cisco send a 404 server not found message after the invite message form the AR according to SIP protocol:
The Cisco Ip phone no answer to invite request from AR150: