Hi all
I have a rather odd problem that I hope somebody can shed some light on. I
have a Asterisk server (1.0.7) that is connected to a Cisco 2600 router
(c2600-is-mz.122-28a) fitted with an E1 card. The E1 is configured for QSig
and is conencted to our local Ericsson MD110 which goes out to the PSTN. We
have a DID range assigned to the E1 and can make and receive calls from/to
SIP attached phones through this gateway setup.
The problem i have is with transfering calls. I can do supervised and
unsupervised transfers from/to any of the IP phones behind Asterisk. I can
also recieve a call from the Ericsson and transfer it to another IP phone
without a problem. What I can't do is receive a call from the Ericsson on an
IP phone and then transfer it back to another Ericsson extension or a PSTN
number. Watching the call progress with Ethereal (really neat VIOP tracker
in the latest version), I can see the call setup take place, the receiveing
phone actually rings, but once I answer the receiving phone the call setup
never completes and the trace shows a continuous stream of invites, acks and
ok's. Here is a sample:
SIP Request: ACK sip:62153@10.12.3.189:5060
SIP/SDP Request: INVITE sip:62153@10.12.3.189:5060, with session
description
SIP/SDP Request: INVITE sip:anonymous@10.12.3.189:5060, with session
description
SIP/SDP Status: 200 OK, with session description
SIP Request: ACK sip:62153@10.12.3.189:5060
SIP/SDP Status: 200 OK, with session description
SIP Request: ACK sip:anonymous@10.12.3.189:5060
The digit 6 is the truck access number to route out to the Ericsson with the
2153 being an Ericsson extension. The anonymous is being received from the
Ericsson instead of CLI at the moment (could this be a problem??)
This sequence of packets repeat continually until one of the phones hangs
up.
My current two suspects are the Cisco gateway that maybe does not support
transfer, but version 12.2x code should do and the Ericsson that is not
communicating correctly with the Cisco.
As an aside, call forwarding from my Cisco 7960 to an Ericsson extension
exibits the same behaviour, but that can be expected I suppose (??)
Any ideas would me most welcome.
Thanks
Andre
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