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

[Dilip Kumar]

Amit,

When you get 183 or 180 ringing, the all the call switching system has done
their job & now the call is with the end user. So the voip providers will
not failover to next carrier.

Regards,
Dilip



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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