[Asterisk-Users] Multi Asterisk Server Transfers

[Michael Graves]

On Thu, 27 Jan 2005 12:58:56 +1100, Mike Sander wrote:

>Hi,
>
>We are in the business of setting up * servers for businesses, attached via
>IAX trunks to our VoIP provider (also using *).
>
>I have a client with a head office * server, who wants a number of remote
>offices, with just 1 SIP connection to each. I can arrange this no probs
>with our providers, but there are issues with transfer.
>
>I don't want the remote offices making their direct SIP connection to the
>head office, because bandwidth is limited and then for them to make an
>outgoing call, the head office has both an incoming and outgoing connection
>- or double the bandwidth. This is the same for an incoming call to head
>office that gets transferred to the remote, the call stays with the head
>office * server, and the server makes another outgoing call to the remote
>office. All these calls are free, but use double the bandwidth.
>
>The question:
>
>The remote offices can make direct SIP connections to our provider. If the
>head office * transfers a call, then the server releases the call entirely
>back to the providers * server and calls from there.
>
>I.E. call in to head office from PSTN through the provider. Call gets
>transferred to the remote office. Head office could then unplug/burn/blowup
>their asterisk server without disrupting the call between the remote office
>and the PSTN network.
>
>Is this possible? Companies with multiple * servers in many remote office,
>surely have this system, to conserve bandwidth? How is the transfer made?
>Mostly we are using X-PRO systems/Grandstream, with the Asterisk at home basic
>release.
>

Seems strange to be handling multiple * servers over SIP and ignoring
IAX2. I'd be inclined to trunk between offices over IAX2. In fact, I'd
use and IAX2 based ITSP and then be able to hand off calls in a
reinvite fashion without all the messy port handling. 

In addition you save on bandwidth by trunking multiple calls over one
IAX2 connection. Less IP overhead, between offices and to the ITSP.

Michael
--
Michael Graves                           mgraves at pixelpower.com
Sr. Product Specialist                          www.pixelpower.com
Pixel Power Inc.                                 mgraves at mstvp.com

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