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

[AMIT ANAND]

Hi Amit,

This is possible , the one scenario i remember is that,

 lets consider a B2BUA

Say it has got 183 and already sent that to Incoming leg. Now some how for
any reason it got BYE message from Outgoing leg to terminate the call.

In such case it will first send 503 to terminate the transaction and then
will send bye to terminate the Dialog.

Cheers
Amit Anand


On Mon, Jun 14, 2010 at 6:22 PM, balajivenkat subramanian <
balajivenkats at gmail.com> wrote:

> 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.
>
> Regards,
> Venkat
>
>
>
> 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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