[Asterisk-Users] Outgoing PRI Call Early Media Detection

[Charlie Watts]

I am having a problem very similar to several discussed on the list
recently.

Making outbound calls on a TE410P PRI to several specific outbound
numbers is not working for me.

Previous posts:
 problem detecting answer on pri card
 800 225 2525 - KLM / NWA reservations
 http://lists.digium.com/pipermail/asterisk-users/2005-April/098918.html

 problem detecting answer on pri outcall
 800 433 7300 - AA
 http://lists.digium.com/pipermail/asterisk-users/2005-April/100941.html
 His PRI trace looks the same as mine!

My specific problems are with:
 800 789 1331 - Quill Office Supplies
 306 239 4885 - Plays a message that this number has been changed

These numbers send the audio from their IVR trees back *BEFORE* they
give a PRI "CONNECT" message. They continue to send "CALL PROCEEDING"
messages during the IVR message so that the call is not disconnected.
After choosing an option, they then send a "CONNECT".

This appears to be legal, per this poster's interpretation of ANSI
T1.113-1995:
http://lists.digium.com/pipermail/asterisk-dev/2004-September/006467.htm
l

When I call these numbers from a SIP phone, all is well - I hear the
message, and am able to choose an IVR selection, even though "show
channels" shows the connection to still be in "Dial" state.

When I call these numbers from another Zap channel, all is very much not
well. Because the outgoing channel remains in "Dial" state, the call is
not bridged.

I'm using A TE410p, with a Qwest PRI. I've tried changing switchtype
from dms100 to national and back. I've tried setting priindication to
inband and outofband. But I don't believe the issue is related to those
settings anyway.

Do other people see this same thing on these numbers?
Does Zap not understand this "Early Media"?
Any suggestions?


My workaround for now is to Answer() before I Dial() for Zap calls, and
extend the dialing timeout on my SIP phones that support early media.
Any comments or better solutions?

-- 
Charlie Watts
cwatts at mercurypay.com
Mercury Payment Systems - Information Technology
970-385-3187, 800-846-4472 x 3187