[asterisk-users] Asterisk DIAL() premature timeout on a PRI trunk to legacy PBX

[Vieri]

An Asterisk extension calls an Alcatel extension via a
PRI link which rings 4 times for about 10-15 seconds
and then drops.
So if the Alcatel user doesn't answer within 10-15
seconds the call is aborted.
(A timeout is *not* specified in the Asterisk Dial
command.)
It seems however that either Asterisk or Alcatel drop
the call prematurely (it's more likely to be on the
Asterisk side).

What could I try?

The Asterisk log displays (* ext is 4053; Alcatel ext
is 5900):

-- Executing
Dial("SIP/4053-08311988","Zap/g1/5900||tTW") in new
stack
-- Requested transfer capability: 0x00 - SPEECH
-- Called g1/5900
-- Zap/2-1 is proceeding passing it to
SIP/4053-08311988
-- Zap/2-1 is ringing
-- Zap/2-1 is busy
-- Hungup 'Zap/2-1'
== Everyone is busy/congested at this time (1:1/0/0)
-- Executing Hangup("SIP/4053-08311988", "") in new
stack
== Spawn extension (from-internal, 5900, 4) exited
non-zero on 'SIP/4053-08311988'
-- Executing Macro("SIP/4053-08311988", "hangupcall")
in new stack
...etc...

The Alcatel board is configured as:

Interface Type + PRA2
CRC4 + YES
Retransmission Timer : 100
TEI Identity Check Timer : 100
Polling Timer : 1000
No. Of Retransmissions : 3
Max Frame Size (Bytes) : 260
Passive board + NO
SS7 signaling + NO

(I also tried to increase the above "Timer" values but
that did not change anything)

In Asterisk's /etc/zaptel.conf I have:

# TE120P (PRI):
span=1,1,0,ccs,hdb3,crc4

bchan=1-15
dchan=16
bchan=17-31

What could be the problem here?

Thanks



      ____________________________________________________________________________________
Luggage? GPS? Comic books? 
Check out fitting gifts for grads at Yahoo! Search
http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz