01-04-2014 04:37 PM - edited 03-16-2019 09:06 PM
What is the difference between digits in-band (IN) or out of band (OOB) in regards to dtfm. When and where is each band use?
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01-04-2014 08:56 PM
In Band DTMF Relay :
>> Send DTMF within the same channel of as RTP
>> Differentiated by Dynamic Payload Type
Cisco RTP (Encoded as Raw sound)
RTP-NTE (Encode as the telephony-event Format in section 3.10 in RFC2833)
Used by MGCP, SIP, H323GW, H323 ICT trunk
Out of Band DTMF Relay :
>> Send DTMF via dedicated signal
>> Differentiated among protocols
H323
h245-alphanumeric
h245-signal (duration capability)
SCCP
KeyPadButton signal
SIP
KPML(Key Press Markup Language using XML and Sub/Not)
SIP-Notify (UNSOLICTED NOTIFY (UN) )
MGCP
Out-of-band (digits event are sent using NTFY message to CA, using RQNT from CA to Agent)
If CA request (R:D/[0-9ABCD*#]) while GW is configured in NSE(in-band, PT 99 NTE), GW will also send out-of-band NTFY as well as inband NSE
DTMF Configuration per SIPTrunk
Some customers may prefer to use one method over the other, or even both for the same call. Four configurable options per SIP Trunk:
Best Effort (Default setting) – Use ANY matched DTMF.
Preferred 2833 – Use 2833 if endpoints behind SIPTrunk support it.
Preferred OOB – Use OOB if endpoints behind SIPTrunk support it.
Preferred Both – Use both KPML and 2833 if endpoints behind SIPTrunk can support both.
The “Preferred” meethods may allocated MTPs even if there is dtmf match
ALL other EP’s except SIP Trunk would be treated as BestEffort.
HTH
Manish
01-04-2014 08:56 PM
In Band DTMF Relay :
>> Send DTMF within the same channel of as RTP
>> Differentiated by Dynamic Payload Type
Cisco RTP (Encoded as Raw sound)
RTP-NTE (Encode as the telephony-event Format in section 3.10 in RFC2833)
Used by MGCP, SIP, H323GW, H323 ICT trunk
Out of Band DTMF Relay :
>> Send DTMF via dedicated signal
>> Differentiated among protocols
H323
h245-alphanumeric
h245-signal (duration capability)
SCCP
KeyPadButton signal
SIP
KPML(Key Press Markup Language using XML and Sub/Not)
SIP-Notify (UNSOLICTED NOTIFY (UN) )
MGCP
Out-of-band (digits event are sent using NTFY message to CA, using RQNT from CA to Agent)
If CA request (R:D/[0-9ABCD*#]) while GW is configured in NSE(in-band, PT 99 NTE), GW will also send out-of-band NTFY as well as inband NSE
DTMF Configuration per SIPTrunk
Some customers may prefer to use one method over the other, or even both for the same call. Four configurable options per SIP Trunk:
Best Effort (Default setting) – Use ANY matched DTMF.
Preferred 2833 – Use 2833 if endpoints behind SIPTrunk support it.
Preferred OOB – Use OOB if endpoints behind SIPTrunk support it.
Preferred Both – Use both KPML and 2833 if endpoints behind SIPTrunk can support both.
The “Preferred” meethods may allocated MTPs even if there is dtmf match
ALL other EP’s except SIP Trunk would be treated as BestEffort.
HTH
Manish
01-06-2014 02:29 AM
Manish...Great post.
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"The essence of christianity is not the enthronement but the obliteration of self --William Barclay"
01-07-2014 04:17 AM
Thanks mate
Manish
01-07-2014 05:41 AM
Very useful info Manish +5 all day long
Carlo
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