DTMF Problems between different Asterisk Versions.

Well, I’m writing this just for personal records, but I’ll be glad if someone finds this information useful.

I updated one of the main Asterisk Servers for one of the Electrosystems Customers VoIP network from 1.2 branch to 1.6, but we noticed troubles with the dtmf’s tones not passing through. So at the end I found a very useful article describing the problem:

Just include this line in sip.conf in your Asterisk 1.6 of 1.4 and it will fix the problem:






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