OK so that makes perfect sense, RFC2833 uses the RTP header and when it is compressed the data required is lost. No more DTMF
Simple :) On Tue, Jun 12, 2012 at 11:45 AM, Tapan Gautam (tgautam) <tgau...@cisco.com>wrote: > Bill,**** > > ** ** > > If I turn off crtp, everything works fine. **** > > ** ** > > Thanks,**** > > Tapan **** > > ** ** > > *From:* Bill Lake [mailto:whl...@gmail.com] > *Sent:* Tuesday, June 12, 2012 11:29 AM > *To:* Krishna > *Cc:* Dan Quinlan (daquinla); Tapan Gautam (tgautam); > ccie_voice@onlinestudylist.com > > *Subject:* Re: [OSL | CCIE_Voice] DTMF from BR1 phone to CUC via SIP > trunk notrecognized properly**** > > ** ** > > Might want to read this as it is the authority on RFC 2833 and it appears > to be out of band however it uses the RTP header. It also appears that the > tones are actually carried in the RTP traffic just not the audio stream. > > http://www.ietf.org/rfc/rfc2833.txt > > Would it be interesting to see if cRTP was turned off if DTMF would work > in this case?**** > > On Tue, Jun 12, 2012 at 7:58 AM, Krishna <vinayak_...@yahoo.com> wrote:*** > * > > Dan,**** > > ** ** > > A small correction to your statement..rfc2833 is out of band mechanism > mostly, and moreover it doesn't use audio channel, infact it uses rtp > header to relay the dtmf message with a payload identifier.**** > > ** ** > > thank you**** > > Krishna..**** > > ** ** > ------------------------------ > > *From:* Dan Quinlan (daquinla) <daqui...@cisco.com> > *To:* Tapan Gautam (tgautam) <tgau...@cisco.com> > *Cc:* ccie_voice@onlinestudylist.com > *Sent:* Monday, June 11, 2012 11:57 PM**** > > > *Subject:* Re: [OSL | CCIE_Voice] DTMF from BR1 phone to CUC via SIP > trunk notrecognized properly**** > > ** ** > > cRTP mangles in-band (audio) DTMF. If I understand correctly, you are > SIP-integrated between CUC and UCM. You need to be OOB only for DTMF (not > rfc2833). Rfc2833 is an in-band (audio channel) mechanism. You need OOB > (signaling channel) for DTMF to function when cRTP is used. **** > > ** ** > > DQ**** > > d...@cisco.com**** > > ** ** > > Sent from my iPhone**** > > > On Jun 11, 2012, at 11:33 PM, "Tapan Gautam (tgautam)" <tgau...@cisco.com> > wrote:**** > > Hey Guys,**** > > **** > > When I call CUC pilot from BR1 phone, the dtmf tones are not recognized > properly by CUC, i.e. BR1 phone cannot login to mailbox or select any other > option via DTMF. If I remove crtp, everything works fine.**** > > **** > > Topology:**** > > SCCP phone(BR1 site) à g729r8 with crtp à CUCM à SIP trunk(with OOB and > RFC2833 as dtmf options) à CUC**** > > **** > > Things I have tried so far,**** > > 1) All dtmf options in SIP trunk.**** > > 2) Enabled mtp option**** > > 3) In CUC, changed codec type to just g711u, just g729 and > both(which is the default).**** > > **** > > I found other posts on this issue but none of them has the solution. **** > > **** > > Thanks,**** > > Tapan**** > > _______________________________________________**** > > > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com**** > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com**** > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com**** > > ** ** >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
