SIP Client

Neil Jerram neiljerram at
Tue Nov 10 22:14:47 CET 2009

2009/11/10 Paul Fertser <fercerpav at>:
> Al Johnson <openmoko at> writes:
>> I had wondered if this might be possible. I've not looked at the idle time
>> between packets to see whether we would get to spend a worthwhile time asleep
>> though.
> From my quick googling it looks like it's only SIP client that usually
> sends some kind of keep-alive; some registrars can do that too but it
> seems uncommon.

If you're suggesting a client/server distinction here, I think that's
false: most SIP phones want both to call out and to be called.
Keepalives are used to keep firewall/NAT pinholes open, so whether
they're needed depends on whether the phone is in a private or public
network.  At home would usually mean private and so require

That said, the standards are still in flux and there are different
possible solutions.  I guess what really matters here is what linphone
does, since being in a private network must be its mainline scenario,
and I'm afraid I don't know that.


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