[Asterisk-Users] all PRI channels are aways busy to * connected modem bank

[Frank at Impact]

I have a modem bank with a T1/PRI interface connected to a TE405P.  Both
devices seem to think that all the channels between them are busy.

When * tries to forward a call (extension 100) to the modem bank, the
console displays the following

app_dial.c:689 dial_exec: Unable to create channel of type 'Zap'
  == Everyone is busy/congested at this time

when I connect to one of the modems using minicom and then try to dial
out, the modem announces BUSY.

Green lights on 405.  no apparent signally problem on startup of *.  *
is pri_net and modem bank always thinks it is cpe only (no other
choice).

Any ideas?

* config's below

zaptel
------
# PRI to modem bank
span=2,1,0,esf,b8zs
bchan=25-47
dchan=48

Zapata
------
[channels]
language=en
context=default
switchtype=national
overlapdial=yes

context=modemServer
signalling=pri_net
group=2
channel => 25-47

extension (relevant section)
---------
[sip]
exten => 1,1,Dial(SIP/phone1,20,tr)
exten => 2,1,Dial(SIP/phone2,20,tr)
exten => 1000,1,Dial(SIP/phone1&SIP/phone2,20,tr)
exten => 100,1,Dial(Zap/25/${EXTEN})

[modemServer]
exten => s,1,Dial(SIP/Phone1,20,tr)