No Ringback Tone when using H323 version 3.

[Vuong Ngoc Trac]

Hello everyone,

I have a cal flow as below"

Customer (H323 v3) --> (H323) GW 3845 (SIP) -->(SIP) Softswitch (SIP)--> PGW --> PSTN

My problem is when customer call telephone numbers of PSTN Carrier A, it has ringbacktone.

But when calling PSTN Carrier B, it doesn't has ringback tone.

Another customer use H323 verison 4 and everything is fine.

However our current customer only can use H323 version 3.

If they use H323 version 3 and calling PSTN Carrier A, GW 3845 sends "Alerting OpenLogialChannel" and caller can hear ringback tone.

But when calling PSTN Carrier B, GW 3845 only sends "Alerting" and caller can not hear ringback tone.

Please give me a solution to solve this problem.

Thank you very much.

[paolo bevilacqua]

Have you tried some of these ?

http://www.cisco.com/en/UStech/tk1077/technologies_tech_note09186a0080094c33.shtml

[Vuong Ngoc Trac]

Dear Paolo,

Thanks for your reply.

The link you provided is Not Found but I guess may be you are prefering to this link:

http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a0080094c33.shtml

Unfortunately, I already tried most of solution on that page before starting this topic.

And my GW 3845 doesn't have any pots dial-peer, it just has voip dial-peer.