[Asterisk-Users] Linksys SPA-941 DTMF failure with asterisk v.1.2

[tracinet]

Been working on testing asterisk 1.2 before upgrading our production systems
from 1.0.x and have found a few issues.  The one I am working on
now involves DTMF failure with the following setup:


*Linksys SPA-941* ---SIP---> *asteriskA(v.1.2)* ----IAX2----> *asteriskB(
v.1.2)* ----SIP-----> *Global Crossing* (PSTN)


g711 with RFC 2833 out of band DTMF is used throughout the entire setup from
the Linksys to Global Crossing.  Asterisk servers are using asterisk
SVN 1.2from Friday.  asteriskA is used as a SIP registrar server for
SIP devices to
connect and asteriskB is used as a gateway to our SIP provider.


In order to test DTMF at each stage, I set up the following so asterisk
could playback which digits I entered:

; Test DTMF
exten => 123,1,Read(NUMBER)
exten => 123,2,SayDigits(${NUMBER})
exten => 123,3,Goto(1)


Here are the tests I ran and the results


*Linksys SPA-941* ---SIP---> *asteriskA(v.1.2)*
Test Passed - DTMF detected with no problem


*Linksys SPA-941* ---SIP---> *asteriskA(v.1.2)* ----IAX2----> *asteriskB(
v.1.2)*
Test Passed - DTMF detected with no problem


*Linksys SPA-941* ---SIP---> *asteriskA(v.1.2)* ----IAX2----> *asteriskB(
v.1.2)* ----SIP-----> *Global Crossing* (PSTN)
Test Failed - poor DTMF accuracy


I then trying reverting asteriskB to version 1.0.x of asterisk and
surprisingly, DTMF worked fine:

*Linksys SPA-941* ---SIP---> *asteriskA(v.1.2)* ----IAX2----> *asteriskB(
v.1.0)* ----SIP-----> *Global Crossing* (PSTN)
Test Passed - DTMF detected with no problem


I then tried using a Cisco 7960 in place of the Linksys SPA-941 and all
worked fine there as well:

*Cisco 7960* ---SIP---> *asteriskA(v.1.2)* ----IAX2----> *asteriskB(v.1.2)*
----SIP-----> *Global Crossing* (PSTN)
Test Passed - DTMF detected with no problem


One would think the issue is with the SIP provider (Global Crossing) but
what makes it odd is that DTMF fails only when using the
Linksys and only when using version 1.2 of asterisk.  So for now I am ruling
out Global Crossing.


Any thoughts?



PS: Bug 5780 states that it is related to g729, not g711 which is in use
here.
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