2833 is the default. INBAND is not a function of the sip module it's implemented on top of the abstraction layer. Are you doing trans coding or different ptimes between the 2 legs? you might want to turn up the debug log "press f8" and you will pretty verbose logging of the 2833. also consider taking a pcap of the network traffic. What is the provider? 2833 is notoriously done wrong to the point that doing it exactly right can put you at a disadvantage. On Thu, Sep 11, 2008 at 4:58 PM, Marc Lewis <marc@avvatel.com> wrote:
I've been having a problem getting DTMF passed through from registered phones to my termination provider. Sometimes it works, sometimes it doesn't. My provider is set for rfc2833.
In looking through the mod_sofia.conf.xml file, and the sofia sources, it appears that the only two options for DTMF are info and rfc2833. I've tried various combinations and the only thing that ever seems to even sometimes work is if pass-rfc2833 is set to true. I've tried this with Linksys SPA 942 phones, Grandstream GXP 2000 phones and Cisco 7940 phones. Doesn't seem to make a difference. I've also tried various dtmf-durations and that didn't seem to have an effect either.
However, after doing various searches it appears that not explicitly setting a dtmf-type in a sofia profile, it defaults to using inband DTMF.
Is this correct? If inband DTMF is the default, then I will have my termination provider switch my account over to using inband instead of rfc2833.
- Marc
-- Marc Lewis Avvatel Corporation
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