SIP trunk Issue on CUBE (no 200 OK)

[ksg222]

Hello!

I  have following topology: TSP --sip-- CUBE --sip-- UCM

Incoming calls from new TSP doesn't work. And I don't understand why. Other TSP (old one) works fine.

CUBE gets Invite from TSP. Try to establish call to UCM. Gets 200 OK from UCM. But doesn't send 200 OK to TSP side. TSP sends Invite again and again.
When I am trying to call I hear silence, no ringback.

Caller id 9012223344, called id 444000. On CUBE I change 444000 to 1857.

Debugs from CUBE in attach:

debug ccsip all
debug ccsip calls
debug ccsip error
debug ccsip events
debug ccsip messages
debug ccsip states
debug voip ccapi inout

Any suggestions welcome
Best regards

Sergey

[Rolando Valenzuela]

I had a similar problem in the past with a SIP provider, I was sending everything right, but I was getting just Invite backs all over and over, not sure if it is the same with you but our fix was adjusting the NAT in our cisco ASA instead of doing it with a nat statement the NAT needed to be done inside the object

WRONG:

nat (transit,outside) source static obj-10.10.20.20 obj-99.88.77.66

FIX:

object network obj-10.10.20.20

 host 10.10.20.20

 nat (transit,outside) static 99.88.77.66

[ksg222]

Hello!
Thank you for your reply. But I don't have a NAT at all. One of CUBE interface has public IP. 

Sergey

[Rolando Valenzuela]

I can see the router sending the correct messages.

Trace Call-ID: 1544-695046-956350 - which I think is the ISP (194.194.194.194), have you check with them? why they are ignoring those messages?

Rolando Valenzuela.