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Poor Voice Quality, Inbound Calls Work, Outbound Calls Don’t on BRI

I had an issue the other day when we replaced an ISDN PRI interface with a BRI. I reconfigured the voice gateway and had inbound calls working – albeit a fair bit of static. However, I could not get outbound calls to go via the BRI interface. I had debugging on for isdn q931 and voip ccapi inout and was seeing entries similar to:

Aug  5 07:51:08.643: ISDN BR0/1/0 Q931: RX <- RELEASE_COMP pd = 8  callref = 0x84
        Cause i = 0x82E404 - Invalid information element contents
Aug  5 07:51:08.643: //21/8043BD33BC09/CCAPI/cc_api_call_disconnected:
   Cause Value=100, Interface=0x4900DFC0, Call Id=21
Aug  5 07:51:08.643: //21/8043BD33BC09/CCAPI/cc_api_call_disconnected:
   Call Entry(Responsed=TRUE, Cause Value=100, Retry Count=0)
Aug  5 07:51:08.643: //20/xxxxxxxxxxxx/CCAPI/ccCallReleaseResources:
   release reserved xcoding resource.
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/ccCallSetAAA_Accounting:
   Accounting=0, Call Id=21
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/ccCallDisconnect:
   Cause Value=100, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=100)
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/ccCallDisconnect:
   Cause Value=100, Call Entry(Responsed=TRUE, Cause Value=100)
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/cc_api_get_transfer_info:
   Transfer Number Is Null
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/cc_api_call_disconnect_done:
   Disposition=0, Interface=0x4900DFC0, Tag=0x0, Call Id=21,
   Call Entry(Disconnect Cause=100, Voice Class Cause Code=0, Retry Count=0)
Aug  5 07:51:08.647: //21/8043BD33BC09/CCAPI/cc_api_call_disconnect_done:
   Call Disconnect Event Sent
Aug  5 07:51:08.647: //-1/xxxxxxxxxxxx/CCAPI/cc_free_feature_vsa:

In the end it turns out I was missing the configuration command compand-type a-law


voice-port 0/1/0
 translation-profile incoming pstn-incoming
 translation-profile outgoing pstn-outgoing
 compand-type a-law
 cptone AU

Note this is for a router in Australia – other countries might be different.

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