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

[Matt Slaga (US)]

If you have an ISR, you can do this with just using software MTP resources instead of DSPs.

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Paul van den IJssel
Sent: Tuesday, June 01, 2010 4:34 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] SIP Trunk for ISP's - DTMF SIP Notify

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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