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Organization: SipXecs Forum
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You will get a lot more responses if you also subscribe to
sipx-users mailing list.

I come to the forum maybe once a month, but if you subscribe
to the mailing list, your posts go there also.


About the current state of trunking in sipx...
**
Interoperable Internet Telephony Service Providers (ITSPs)

Following are the minimal requirements for interoperability
:
Must support RFC 3261
Must support Re-INVITE (with and without SDP) for mid-call
codec renegotiation.
Must support Session Timer.
Must support P-Asserted-Identity extension header to present
correct caller ID during call forwarding and blind transfer
operations and for anonymous calling.

While SIP interoperability in general has made significant
progress, it is still required to test interoperability with
each and every ITSP to make sure all the required features
for successful SIP trunking work. the following is the
current list of ITSPs that we were able to test against.
This list highly depends on the availability of suitable
test accounts. Should your preferred provider be missing and
you would like to get it added, please say so on the
sipx-dev mailing list. If you can provide a test account
together with your request, then that would increase the
chances of getting help with resolving interoperability
issues.
CAVEAT : An entry in the table below does not guarantee that
the ITSP is well behaved or of good quality. Careful testing
has been performed on bandwidth.com, at&t, bt.com and
cbeyond.net. An entry in the table indicates that somebody (
for example, member of the sipx user community ) has tried
out the ITSP and has reported that it worked and has shared
their settings.
att.com
bandwidth.com
bt.com
voxitas.com
sipcall.ch: sipcall is an ITSP in Switzerland. DID numbers
in Switzerland are free.
CallWithUs: CallWithUs is an international VoIP provider
offering SIP and IAX service
Cbeyond: Cbeyond is focused on small business and provides
dedicated T1 service. They are also the initial supporter of
the SIPconnect standard for SIP trunking.
voipuser.org: voipuser.org is a free ITSP service that
offers you a fee did and limited outbound dialing
privileges.
les.net: les.net is an ITSP in Canada. It can be configured
to support North American 7-digit and 10-digit dialing.
eutelia.it
Vitelity.net
vitaltalk.com
Voip.ms
callcentric.com
simplesignal.com
bluesip.net
unlimitel.ca
flowroute.com
Nortel CS1K based systems.
**

I dont recall you've stated who the itsp is. Perhaps you can
ask if they support the features NEEDED in order to comply
with the trunking module, or perhaps find one that does?
-- 
=====================
Tony Graziano, Manager
Telephone: 434.984.8430
sip: mailto:[email protected]
Fax: 434.984.8431

Email: mailto:[email protected]
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