[SR-Users] question about cseq handling

[Mikko Lehto]

通 <shuntongzhang at gmail.com> wrote:

> In urecord.c:get_ucontact_by_instance, REGISTER without instance-id will
> check cseq number(must be higher), REGISTER with  instance-id will not
> check cseq number.
> 
> what is the difference?why not check cseq in REGISTER with instance-id?

Hi

I am not familiar with the mentioned code, but from outbound rfc
point of view it seem to be related to detecting device even if
it has restarted.

See 5626 for more: https://tools.ietf.org/html/rfc5626#section-3.1

-- 
Mikko Lehto