[OpenSIPS-Users] 3rd party Client sending 5xx

Jeff Pyle jpyle at fidelityvoice.com
Tue Jan 5 04:43:16 CET 2010


That all depends on the switch.  Asterisk sends a 503 if you look at it the wrong way, that is, under many conditions.  In my experience most carriers will send a 503 when their upstream paths are full (or your concurrent calls to them is full) and they expect you to route advance to another carrier.  A 503 could cause a proxy or a switch to blacklist the host that sent it for a period, so proxies (Opensips included) will convert a 503 to a 500 before relaying.

When a switch has trouble processing the request because of some internal issue, say, a database error, it will reply with a 500.

This list is by no means all inclusive.  Hopefully it will point you in the right direction.

- Jeff

On Jan 4, 2010, at 10:13 PM, Aditya Kumar wrote:

Thanks Jeff for the link.
I did see 3261.

Question is : RFC will tel high level about response codes.
I am trying to understand in particular when a End User (UAS) will sent.

I am clear from a proxy perspective.

Was looking some one can share your experiences when a UAS will send 5xx
From: Jeff Pyle <jpyle at fidelityvoice.com<mailto:jpyle at fidelityvoice.com>>
To: OpenSIPS users mailling list <users at lists.opensips.org<mailto:users at lists.opensips.org>>
Sent: Mon, January 4, 2010 7:01:34 PM
Subject: Re: [OpenSIPS-Users] 3rd party Client sending 5xx

Please see:

On Jan 4, 2010, at 9:53 PM, Aditya Kumar wrote:

Hi all,

I am inter working with a 3rd party SIP UA and I see they are sending 503/500.
Can any one tell me what are the cases at which a SIP UAS will sent 503 or 500

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