Don't know if it can help you, but please take a look at this:
http://sipx-wiki.calivia.com/index.php/SipXbridge_Overview_and_Configuration

That says:
"Typically ITSPs do not handle certain types of SIP requests such as
*REFER*which is used in Call Transfer operations. To implement call
transfer,
SipXbridge does signaling translation, converting a *REFER* request to an *
INVITE* request to the call transfer target. Consequently, a ringing tone
will not be heard at the calling phone during call transfers when the call
is routed through SipXbridge"

On Thu, Dec 3, 2009 at 8:04 AM, Tony Graziano
<tgrazi...@myitdepartment.net>wrote:

> When you login to sipxconfig it will display at the bottom.
>
> ============================
> Tony Graziano, Manager
> Telephone: 434.984.8430
> Fax: 434.984.8431
>
> Email: tgrazi...@myitdepartment.net
>
> LAN/Telephony/Security and Control Systems Helpdesk:
> Telephone: 434.984.8426
> Fax: 434.984.8427
>
> Helpdesk Contract Customers:
> http://www.myitdepartment.net/gethelp/
>
> ----- Original Message -----
> From: Dan White <dwh...@citadelitg.com>
> To: Tony Graziano <tgrazi...@myitdepartment.net>; sipx-users
> <sipx-users@list.sipfoundry.org>
> Sent: Wed Dec 02 16:03:13 2009
> Subject: RE: [sipx-users] Problem with call forwarding
>
> Sorry, I am using Vitality.net as my sip trunk.
>
> I am not sure which version of the software I am using, how do I tell?
>
>
>
> Dan White
>
> From: Tony Graziano [mailto:tgrazi...@myitdepartment.net]
> Sent: Wednesday, December 02, 2009 3:55 PM
> To: Dan White
> Subject: Re: [sipx-users] Problem with call forwarding
>
>
>
> A little better explanation would be helpful.
>
>
>
> What kind of gaateway is the call coming in on, out on?
>
>
>
> Is your forwarding a user forwarding (at the same time or if no answer?
> If it goes out a PSTN (analog pots) gateway, you might want to confirm
> the gateway works and has a more gracious timeout period since the call
> setup is a w-e-e-e-e bit longer than a digital one. Are you using 4.0.4?
>
>
>
> Thanks.
>
> On Wed, Dec 2, 2009 at 3:46 PM, Dan White <dwh...@citadelitg.com> wrote:
>
> I setup a user when a call comes in it gets routed to an internal ext
> say 204, if it no one picks up, it suppose to forward to an external
> number, but this just doesn't seem to work. Sometimes it rings on the
> other side, but you can't hear anything. Is this a known issue?
>
>
>
> Dan White
>
>
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