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
_______________________________________________
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>
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_______________________________________________
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
