[asterisk-users] SIP kpml DTMF support in *

Raj Jain rj2807 at gmail.com
Thu Apr 19 05:39:59 MST 2007

KPML is now an RFC -- http://www.ietf.org/rfc/rfc4730.txt

Asterisk doesn't support KPML today. That doesn't mean it can not be
developed if there is sufiicient interest. The true value of adding KPML
support in Asterisk is when it is acting as a 'softswitch' (call controller
without media hairpin) such that it can install a digit map and collect
digits from end-points over the signaling path.


On 4/19/07, Grigoriy Puzankin <gpuzankin at gmail.com> wrote:
> Hi,
> I'm trying to connect Asterisk 1.4 and Cisco CallManager 5 using SIP
> Trunk without MTP (media termination point). Howerver, Cisco 79xx phones
> do not support RFC2833, they always notify CCM5 via SKINNY channel no
> matter where they send RTP to.
> For non-MTP trunk there's Out-of-band DTMF support in CCM5 called
> "kpml". I wonder if Asterisk can support it.
> I found an intertnet-draft for kpml:
> http://tools.ietf.org/id/draft-ietf-sipping-kpml-07.txt, but it seems to
> be very old - "Expires June 25, 2005".
> I know that using MTP in SIP Trunk at CCM5 makes DTMF work in RFC2833,
> but MTP resource is very limited and I don't want to proxy RTP via CCM5.
> Please, do not offer to use H.323.
> Thanks in advance.
> Grigoriy.
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