[asterisk-users] DTMF Problem w/ MeetMe

[Phillip Heller]

First, the scenarios:

Call placed from Boston to locally configured Asterisk Meetme extension:

Cisco 7941 <-SCCP-> Cisco 2821(CME,Boston) <-SIP-> Asterisk(Boston)

Call placed from Boston to European Asterisk Meetme extension:

Cisco 7941 <-SCCP-> Cisco 2821(CME,Boston) <-SIP-> Cisco  
2821(CME,Europe) <-SIP-> Asterisk(Boston)

In the 1st scenario, everything works great.  I dial the extension on  
the 7941, Asterisk parses DTMF just fine.

In the 2nd scenario, DTMF digits do not interrupt the "Please enter  
conf #" announcement, and when I do finish entering the same conf #  
used for scenario #1, it announces "Invalid Conf #".  With channel  
debugging enabled on Asterisk, I see that I often get duplicate DTMF  
entries.  So where I might have dialed 1234#, Asterisk sees 112344# or  
similar, under scenario 2.

All dial-peers involved on the 2821's are configured for dtmf-relay  
rtp-nte, and debugging shows this to be the negotiated dtmf method.

Interestingly, there is a 3rd scenario which adds to the confusion:

Call placed from Boston to European Asterisk Meetme *DID*:  (note the  
trip out to the PSTN is simply a hairpin in this case)

Cisco 7941 <-SCCP-> Cisco 2821(CME,Boston) <-SIP-> Cisco  
2821(CME,Europe) <-PRI-> PSTN <-PRI-> Cisco 2821(CME,Europe) <-SIP->  
Asterisk(Boston)

This is using Asterisk 1.6.0.5

I've tried altering relaxdtmf in sip.conf to no avail.  dtmfmode is  
set to auto.

Any suggestions?

Regards,

--phil