[SIPForum-discussion] Route advance query

Sat Oct 25 17:15:04 UTC 2008

Hi Ankit

 Till the call is successful (origin gets 200 OK) , the alternate route
should not be discarded.  As Sandra mentioned,18x can happen due to
hetrogeneous network. Tags are useful for such calls

Thanks & Regards
Abhishek

________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of ext Ankit
Sent: Friday, October 24, 2008 11:45 PM
To: Cirlincione, Sandra
Cc: discussion at sipforum.org; discussion at sipforum.com
Subject: Re: [SIPForum-discussion] Route advance query

Sandra,

Its a problem of a Voice call

Call flow is like:-

Clients GW<------->Our SBC<------->Vendor GW

Our SBC legs are:-

Leg1-- clients GW<----Our SBC
Leg2-- Our SBC<----Vendor GW

Call flow between Our SBC and Vendor GW is:-

Our SBC                                           Vendor GW
                     Invite.....>
                    <100 trying..........
                    <180/183..............
                    < 503 service unavailable----------------

As, you can see above that vendor is sending us 180 and then 503. So my
concern is that will my SBC do any route advance for my client for the
same Call-id, if my running vendor sends me error code like above?

-- 
Thanks and Regards,
Ankit Kumar

2008/10/24 Cirlincione, Sandra <sandra.cirlincione at boeing.com>

	This sounds like you have an intermediate device that is
providing the 18x response.  If that's the case, then the device that is
providing the 18x response, should also be receiving the 503, and would
then reroute on its alternate path, not return the 503 back to the
vendor.  The other condition is that you may get one leg connectivity,
with a one-way conversation, without the other side terminating.

	What we saw, was that we only received the 503 if the 18x could
not complete. If the 18x completed, but the call could still not be
connected, then we saw a 200 Ok message, but the call was not connected,
and we received a fast busy on the caller side.

	Are you doing voice only, or a mix of other media?

	Sandra.Cirlincione @boeing.com 
	SSG - IT, Enterprise Voice Engineering, VoIP/Convergence 
	MOC pilot 425.865.3214    (One number reach) 

	Home Office 425.373.8293 
	Desk  206.766.5888
	Cell 425.417.3138 
	Wishing you happiness, hope, or health, take what you need. 

	From: Ankit [mailto:erankitkumar at gmail.com] 
	Sent: Friday, October 24, 2008 10:01 AM
	To: Cirlincione, Sandra
	Cc: discussion at sipforum.org; discussion at sipforum.com 

	Subject: Re: [SIPForum-discussion] Route advance query

	Sandra,

	I appreciate your response.

	As per the response code, it should definitely do route advance.
But my concern is that will it do route advace, if my vendor sends me
the release code after 18X......not after 100 trying message.

	Concern is that once 18X is being sent from my vendor side, it
indicates that OLC has been established / or Media path has been
established. So will route advance works, if media path has already been
established on the current vendor?

	-- 
	Thanks and Regards,
	Ankit Kumar

	2008/10/24 Cirlincione, Sandra <sandra.cirlincione at boeing.com>

	Ankit,

	Experience over the last few days with this, would indicate that
it will  advance if you have something in your configuration to force
the next route.

	A 503 error seems to indicate that the service is not reachable,
unavailable, or cannot complete.  It basically looks like an
"unsuccessful" call attempt which tells your system that the route
you've chosen was not successful.  That reply allows the routing device
to try the next preference route.

	Sandra.Cirlincione @boeing.com 
	SSG - IT, Enterprise Voice Engineering, VoIP/Convergence 
	MOC pilot 425.865.3214    (One number reach) 

	Home Office 425.373.8293 
	Desk  206.766.5888
	Cell 425.417.3138 
	Wishing you happiness, hope, or health, take what you need. 

	From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Ankit
	Sent: Friday, October 24, 2008 2:49 AM
	To: discussion at sipforum.com
	Subject: Re: [SIPForum-discussion] Route advance query

	Can somebody help me out?

	-- 
	Thanks and Regards,
	Ankit Kumar

	2008/10/24 Ankit <erankitkumar at gmail.com>

	Hi Folks,

	I need one suggestion on a query. Scenario is:-

	Lets say we have 2 backup vendor on routing. Will the GW or
Switch or SBC do route advance if he gets error (lets say 503 or 34 in
ISDN) from his previous vendor after 18X message?

	Ex:-

	Invite.....>
	<100 trying..........
	<180/183..............
	< 503 service unavailable----------------

	If yes, then why so and if no, why no?

	-- 
	Thanks and Regards,
	Ankit Kumar

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