10-28-2008 07:25 AM - edited 03-15-2019 02:12 PM
Hi, I have a scenario :
ip pnone---ccm---gw---pbx1---pbx2
Using a IP Phone, when i call to pbx1 it works. But if i call to pbx 2 i not ear ringback tone. In the debug isdn q931 only i see a difference in the RX <- PROGRESS. When i receive this param not ear ringback tone.
11-04-2008 11:29 AM
No Ringback tone issue is commonly caused when the inbound call does not come in to the Cisco gateway/ router with a PI=3. ISDN switches send the PI=3 in the Setup message to inform the gateway that the originating call is non-ISDN and in-band messages are expected.
07-07-2009 07:01 PM
Having the same problem. Did you ever find a solution.
Thanks,
Eric
07-07-2009 10:37 PM
Hi Eric,
Did you try configuring progress_ind alert enable 8 command under the POTS dial peer that matches outbound calls?
Best regards,
- Adrián.
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