[SIPForum-discussion] A question on SIP Registration Interval

[Onur Cinar]

Hi Andrew,

Yes, that is the case, your UA should obey the registrar's decision. Based
on your example, the registrar will keep your registration for 30 seconds,
and then it will clean it from its database. So for example, if your UA
receives an INVITE at 45 seconds then the calling party will get a 404
although your UA is still running. So you should register in every 30
seconds instead of 60.

Based on my experience, in your UA, make sure to register a little earlier
than 30 seconds. I'm mostly registering 5-10 seconds earlier to make sure
that my registration won't expire due to some unexpected application
side/network delays.

Best regards,

-onur

--
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A. Onur Cinar - Senior Software Engineer
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On 6/13/07, Andrew Yu <andrew at asiatel.com.sg> wrote:
>
> Dear members,
>
> I'll like to know exactly how SIP registration interval is implemented
> by the RFC.
>
> When UA send register request with expires 60 and registrar return 200
> OK but with expires 30, does this mean the next re-register sent by the
> UA will be sent at expiration interval of 30? What will happen if I've
> configured the endpoint to re-register every 60s, does this mean that
> the configured setting will be over-ride by the registrar? Thank you.
>
> --
> Cheers,
>
> Asiatel Singapore Pte Ltd
> Andrew Yu
>
> 19 Jalan Kilang Barat
> #06-01, Acetech Centre
> Singapore 159361
>
> Tel: +65 6271 8233
> Fax: +65 6274 4266
>
>
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