CUCM SIP Trunk issues

[Kosi227]

Hi all,

we received a problem from a customer about their CUBE SIP , the customer can use the sip for out going call and it was working fine, but when people trying to call to their ip phone from outside, the phone will ring, when he pick up will no audio and got fast busy tone. 

we try to change the early offer setting and mtp in CUCM , but same result.

we capture the ccsip message and found that , that CUBE keep sending invite message to CUCM, but the CUCM doesn't  reply acknowledge message. any one know why would this happened ?

i attached the setting and debug in here and please help 

connection diagram:

CUCM -> sip trunk --> cube -->SIP --> ITSP

IP PHONE --> make call --> SIP   success

outside call to ITSP -->SIP -->CUBE--> CUCM   ip phone will ring but fail to pickup

Thanks

[Mohamed Amine Jaafar]

Please take a packet capture from CUCM side and confirm that CUCM actually received these SIP messages.

[Kosi227]

finally we found out the root cause is the ASA block the RTP signal by SIP inspecting setting,

and the problem solved after enable it

thanks all !

[jonathan.salter]

Sounds like a media resource/codec mismatch issue. What are the region settings in CUCM?