NEC SV 8500 SIP Connection with Cisco

[gohar_arc01]

We are doing SIP trunk integration  between Cisco  call manager and NEC SV 8500. From NEC we are able to call Cisco user but one way speech ( Cisco user can hear NEC  voice)  but from Cisco we are not able to call NEC.

Can anyone help me on this issue

[Vivek Batra]

Probably if you resolve second issue, first issue should also get resolved unless there is some network issue.

CUCM by default uses delayed offer which most of the PBX don't like. Either enable the SIP early offer under SIP Profile in CUCM OR share the SIP traces to know what's going on.

- Vivek

[Dennis Mink]

check your routing  and ACL's first  mate.

[Dpresotto]

I have a same problem, but I don't have firewall, is the same network. CUCM 12.5 and NEC SV8300. 

NEC calls to CUCM are made. FROM CUCM to NEC I get error SIP2.0 504 Server timeout.