Using Asterisk 1.0.x, I'm seeing the following when trying to allow the
called party to transfer calls:
sip phone --> asteriskC --IAX2--> asteriskA --ZAP--> PSTN --> called
party
i.e. a sip user on server asteriskC places a call, which is sent to the
PSTN via IAX2 to asteriskA. asteriskC includes the t flag in its
Dial(IAX2/...). This case works, though I found that the called party can
only transfer calls to extensions asteriskC makes accessible to
asteriskA via context= in the iax.conf entry...which I suppose makes
sense.
However, if the call flow is:
asteriskB --IAX2--> asteriskC --IAX2--> asteriskA --ZAP--> PSTN ->
called party
i.e. a call comes into asteriskC via IAX2, and is either:
a) answered by a SIP client who transfers the call to an exten that dials
out (with t flag) via IAX2 to asteriskA and the PSTN
b) is Answered in the dialplan and then sent via Goto to an exten that
dials out (with t flag) to the PSTN via IAX2 to asteriskA.
In these cases, the called party cannot do a # transfer. I found
asteriskC could only recoginze a #transfer attempt by the called party if
I forced a mismatch in codecs between the incoming and outgoing IAX. Even
with that, though, I can't get #transfer to work as the called party seems
to have no context. i.e.
-- Operating with different codecs, can't native bridge...
-- Playing 'pbx-transfer' (language 'en')
-- Unable to find extension '4' in context ''
As soon as I dial any digit after #, asteriskC errors saying the extension
is not found in a null context.
Is what I'm trying to setup possible on a server with no direct PSTN
access? All PSTN origination and termination is done via IAX2.
I've just tested this with the recently released version 1.2 of Asterisk
on asteriskC, and the behavior is largely unchanged. 1.2 seems to do a
better job of noticing the # even while it says it's natively bridged the
calls, but I still get an Unable to find extension '<first digit
pressed>'
in context '' suggesting that the called party trying to do a #transfer
has no context.
----------------------------------------------------------------------
Jon Lewis | I route
Senior Network Engineer | therefore you are
Atlantic Net |
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