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No ringback tone when calling from h323 trunk to ccme

Arber_123
Level 1
Level 1

Hello everyone,

I am having an issue with an H323 trunk between Cisco CME 8.1 (running on 2911) and a VoIP Service Provider.

The problem is that when i recieve calls from this trunk (inobund to ccme from the perspective of the router) the Calling party does not hear the ringback tone.

Outgoing calls from CCME to the trunk work fine, and i can hear on my IP Phone the ringback signal.

Does anyone have any idea how to address this problem?

Regards,

Arber.

5 Replies 5

I have checked this link, and configured the dial-peers as instructed.

Please note that I cannot configure the POTS dial-peer because this is the part of the Service Provider

I see that the problem has to do with the ISDN  PI values

here is the dial-peer config and other importat pieces

voice-class h323 1
codec g729br8

dial-peer voice 1001 voip
tone ringback alert-no-PI
destination-pattern 355T
progress_ind setup enable 3
translate-outgoing calling 1001
session target ipv4:80.78.64.16
incoming called-number 355T
voice-class h323 1
codec g729br8
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback cisco

interface GigabitEthernet0/2.208
encapsulation dot1Q 208
ip address 192.168.209.93 255.255.255.0
h323-gateway voip interface
h323-gateway voip bind srcaddr 192.168.209.93

ip route 80.78.64.16 255.255.255.255 192.168.209.1

voice service voip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
redundancy
redirect ip2ip
fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none
h323

Also I am including the outputs from the debug cch323 h225 attached with this message.

Two tests are made outbound (ok) and inbound (bad).

Thank you for the support!

Arber.

Check with your provider. From the debugs it seems that we're sending an H225 ALERTING message w/ PI=0

//4783/7A4FCD489555/H323/run_h225_sm: Received event H225_EV_ALERT while at state H225_ACC_FS_CALLPROC
//4783/7A4FCD489555/H323/cch323_h225_set_new_state: Changing from H225_ACC_FS_CALLPROC state to H225_ACC_FS_ALERT state
//4783/7A4FCD489555/H323/generic_send_alert: ====== PI = 0

If that's the case the Provider or the local switch to the calling party should be playing local ringback.

Thank you for the response,

Can I make the GW to tell the provider that the ringback tone (for the incoming calls to the GW) will be played from this GW.

I know that this maybe is weird, the ringback will be played inband from the terminating GW, but I would like to know if that is possible.

Thanks,

Arber.

I suppose you can by changing the PI sent in the H225 Alerting to PI=8. But even if you do that I'm not sure if the Cisco gateway (CME in this case) would play inband ringback since technically there's no DSP in the call flow to play the ringback. But that's just my guess since I haven't tested this before.

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