Thanks Dan. I always had OOB & RFC2833 option selected in SIP trunk
configuration as there is no option to just select OOB. After reading your
response, I started digging CUC side configuration and found that DTMF type can
be set under ‘Port Group settings’ as well. I unchecked ‘Use DTMF RFC 2833’
option, while keeping oob method - ‘Use DTMF KPML’ option checked. After this
change, DTMF was correctly recognized by CUC.
Thanks for your input.
-Tapan
From: Dan Quinlan (daquinla)
Sent: Monday, June 11, 2012 11:58 PM
To: Tapan Gautam (tgautam)
Cc: ccie_voice@onlinestudylist.com
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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_______________________________________________
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
