[asterisk-users] DTMF not reproduced towards ZAP T1 Port after connection when arrives as SIP

[Barton Fisher]

I place SIP DID call towards ZAP (TE410P). ZAP uses e&m signaling to an
external IVR system. I can hear the asterisk sending the DTMFs properly
toward ZAP at call setup. After the call connects, any further DTMF digits
from SIP is very short sounding or distorted (barely audible)  on the ZAP
and ignored. ZAP to ZAP connections work perfect.

Just so you know, with 1.2 this is not an issue and this issue is keeping me
from moving to 1.4.

I have a test system setup with a SIP DID to a test IVR system to
demonstrate this problem. I can provide full access to these systems for
testing. I've placed on Digium bugs but have not received any responses yet.
There is nothing in the logs or cli that provides anything meaningful -
Below is a call where I press '*' and it is ignored.

[7147832205-inn] ROUTING TO: CUST 03 [*7142318000*7147832205*]
    -- Executing [7147832205 at call-cust-03:12] Dial("SIP/innov-09a73f78",
"Zap/g5/*7142318000*2205*|10|r") in new stack
[Jun 19 15:26:15] DEBUG[12160]: chan_zap.c:1949 zt_call: Dialing
'*7142318000*2205*'
[Jun 19 15:26:15] DEBUG[12160]: chan_zap.c:2025 zt_call: Deferring
dialing...
    -- Called g5/*7142318000*2205*
[Jun 19 15:26:15] DEBUG[12160]: chan_zap.c:4378 zt_handle_event: Ignoring
wink on channel 97
[Jun 19 15:26:16] DEBUG[12160]: chan_zap.c:4441 zt_handle_event: Sent
deferred digit string: T*7142318000*2205
[Jun 19 15:26:19] DEBUG[12160]: chan_zap.c:1452 zt_train_ec: Engaged echo
training on channel 97
[Jun 19 15:26:21] DEBUG[12160]: chan_zap.c:1415 zt_enable_ec: Echo
cancellation already on 
   -- Zap/97-1 answered SIP/innov-09a73f78
[Jun 19 15:26:30] DTMF[12160]: channel.c:2204 __ast_read: DTMF begin '*'
received on SIP/innov-09a73f78
[Jun 19 15:26:30] DTMF[12160]: channel.c:2215 __ast_read: DTMF begin
passthrough '*' on SIP/innov-09a73f78
[Jun 19 15:26:30] DEBUG[12160]: chan_zap.c:1050 zt_digit_begin: Started
VLDTMF digit '*'
[Jun 19 15:26:30] DTMF[12160]: channel.c:2129 __ast_read: DTMF end '*'
received on SIP/innov-09a73f78, duration 100 ms
[Jun 19 15:26:30] DTMF[12160]: channel.c:2176 __ast_read: DTMF end accepted
with begin '*' on SIP/innov-09a73f78
[Jun 19 15:26:30] DTMF[12160]: channel.c:2192 __ast_read: DTMF end
passthrough '*' on SIP/innov-09a73f78
[Jun 19 15:26:30] DEBUG[12160]: chan_zap.c:1085 zt_digit_end: Ending VLDTMF
digit '*'

I'm using:
Asterisk Source Version : 1.4.21
Zaptel Source Version : 1.4.11
Libpri Source Version : 1.4.4
Addons Source Version : 1.4.7

Please help, I'm stuck on 1.2 until resolved - Thanks

Bart