MPE can't detect DTMF key press

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Jan 12th, 2009
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i use mpe create a meeting, and invote another man to join it though mpe out-dial.

the man can listen the voice menu, prompt him press "1" to join the meeting, but mpe can't detect the dtmf.

and i turn debug on voice gateway: "debug voice ccapi inout". find that the voice gateway can't detect dtmf signal too.


but i from outside dial out ipt system, ipt system can detect the dtmf signal (like out IVR system).


who can tell me what problems occured?

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Nicholas Matthews Mon, 01/12/2009 - 20:17
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It's possible you're hitting a DTMF bug on the gateway.


Where is the DTMF coming from, what type of protocols are in use, what type of dtmf is configured, and what version is your gateway?


-nick

chenhao Mon, 01/12/2009 - 20:31
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1. DTMF come from outside(PSTN).


2. voice gateway is H.323 gateway.


3. voice gateway is 1751-V, and use fxo voice card connect to PSTN network.


4. DTMF Configure was follow:

! 8000 is our Auto-Attendant

! 8087 is our one direct line phone

dial-peer voice 8000 voip

destination-pattern 8000

progress_ind setup enable 3

voice-class codec 100

session target ipv4:10.128.133.110

dtmf-relay h245-alphanumeric

fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none

ip qos dscp cs5 media

ip qos dscp 31 signaling

no vad

!

dial-peer voice 8087 voip

preference 2

destination-pattern 8087

progress_ind setup enable 3

voice-class codec 100

session target ipv4:10.128.133.110

dtmf-relay cisco-rtp h245-signal h245-alphanumeric

fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback none

ip qos dscp cs5 media

ip qos dscp 31 signaling

no vad

!


5. gateway version is: C1700 Software (C1700-IPVOICEK9-M), Version 12.4(15)T7.


thanks.

Nicholas Matthews Tue, 01/13/2009 - 05:53
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There's a bug in 12.4(15)T7 that may cause duplicate DTMF. You can upgrade to 12.4(15)T8 to test if this is the problem or not.


Otherwise, 'debug voip dialpeer' and make sure you're hitting the expected dial peers.


You can 'debug h245 asn1' to see the alphanumeric DTMF if you want to see if the gateway is sending it or not.


hth,

nick

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