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New Member

J4W cannot call EX90 over SIP Trunk to VCS

I have J4W version 9.6 with CUCM 9.1 integrated over SIP Trunk to VCS version 7.2 and EX90 endpoint.  Whenever J4W make a call to EX90 the EX90 would answer the call but from J4W it is still ringing continously until hang up call (no audio or video).  When EX90 make a call to J4W, the call is answered from J4W but from EX90 it is still ringing and then after 10 seconds a busy tone is heard on J4W.

If we enable MTP on the SIP Trunk the call is connected but I am getting no video because it is software MTP.  However on the documentation I should not need to enable MTP.  I have followed the documentation very carefully.

If we enable SIP trace for non-MTP call we see that the VCS just continously send INVITE but getting no respond back from CUCM.  Am I hitting a bug?



New Member

 I have the same problem -


I have the same problem - J4W version 9.6 registered with CUCM 9.1 trying to call EX90 registered with VCS 7.2.2 over a SIP trunk. Call is established but no audio/video. Checked Firewall and routing - no issues. Please let me know if you find something and I will do the same.

New Member

Hello Vinh, I was trying a

Hello Vinh,


I was trying a lot of different things and the last thing I changed was to set the media encryption mode on the CUCM neighbor zone to unencrypted to make this work.

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