[cisco-voip] SIP Trunk for ISP's - DTMF SIP Notify

Tue Jun 1 16:34:03 EDT 2010

 Hi Guys,

Currently I'm testing a SIP Trunk with our ISP. Everything is working fine
but I don't get the DTMF to work. This because my SCCP phones only support
OOB DTMF. So to get it to work with SIP RFC2833 (in-band) I need an
expensive transcoder. But now we've set the SIP Trunk to SIP Notify
(out-band) which should work with the IP Phones OOB, but all I get is
'SIP/2.0 403 Forbidden'.

How do I get this to work without the use of a hardware Transcoder?

Best regards,

Paul van den IJssel
Digacom
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