[SIPForum-discussion] Getting 503 & 603 after SIP session progress

balajivenkat subramanian balajivenkats at gmail.com
Mon Jun 14 12:52:18 UTC 2010

Hi Amit ,

This is not the right behaviour from the termination provider and this
issues happens if the far end provider has server failure issues and 5XX is
meant for server failure issues.

Restart of application / servers may fix the issue and purely depends on the
individual SBC's.


On Sat, Jun 12, 2010 at 7:06 PM, amit salunkhe <amitsalunkhe21 at gmail.com>wrote:

> HI All
> Is this following signalling behavior is the right if calls going form VOIP
> to PSTN.
> VOIP provider1---------------------->VOIP Provider2------------->PSTn
> network--------------->PStn user
> Suppose VOIP provider 1 getting SIP response 503 or 603 after SIP session
> progress 183 or 183 ringing, is this right behavior in terms of SIP
> signalling.if this is the case can VOIP provider failover that call to next
> carrier?
> Also where shud be the problem at VOIP provider 2 or respective PSTN
> network telco?
> under this condition how VOIP provider can nadle such error signall at
> there end if they are using SBC.
> Thanks
> Amit-
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