Recently our customer's UC560 stop receiving DTMF inbound from SIP trunk. DTMF works find outbound and on-net. UC560 has been in production for 5 years. The SIP provider is asking that Re-Invite be enabled and inbound set to auto. How do I configure? Related dial peer is below.
dial-peer voice 3035 voip description 1703-AA translation-profile incoming 1703-AA_Called_39 session protocol sipv2 session target sip-server incoming called-number 6505911703 voice-class codec 1 voice-class sip dtmf-relay force rtp-nte dtmf-relay rtp-nte ip qos dscp cs5 media ip qos dscp cs4 signaling no vad
Re: DTMF failing inbound for UC560 from SIP provider
I have no experience with UC5xx at all. But according your description of issue and provider's response I assume it's because of codec and/or DTMF method configuration change on provider's side.
A assume he is asking for re-INVITE to be able to re-negotiate codec to an uncompressed one. "Automatic DTMF method" seems to be requested in attempt to support all methods possible.
As far as I know, incoming re-INVITE is accepted, thus there's no configuration change required. I don't know how to configure DTMF method accepted, check Administrator's guide for the appropriate firmware version (you decided to keep secret the version you are using).
Generally, you should consider to configure G.711 codec as the only codec accepted for incoming call. It will allow both RTP and in-band DTMF to pass not distorted to you.
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