[Serusers] Question about general SIP timers in productionenviroments.

[Greger V. Teigre]

This is dependent on the type of deployment and your preferences.  If you 
have a deployment scenario with fixed line replacement, you probably have 
users who don't move around a lot.  Then 3,600 seconds is a typical number.
    Sending NOTIFY as a way to keep the NAT open is something you should 
avoid. I don't know who started this, but sending an empty UDP is more than 
enough and does not require ser to do any processing of the incoming packet. 
Of course, if NOTIFY is used for communicating something, it's a different 
thing...
    The minimum ping time configurable in UAs is often 20 seconds. 
Normally, you could ping every minute or so and everything would be fine. 
The problem is that you will not know which UAs that are behind NATs with 
low expiry time. Also, if the NAT mapping table starts getting full, the 
expiry time will often be reduced.
g-)

Ricardo Martinez wrote:
> Hello list.
> Does someone knows which are the best or most common timers for :
>
> - REGISTER Expire? How often i send the REGISTER message to SER.
> - If i'm behind a NAT and i am sending NOTIFY messages to mantain
> the bind open, which is the optimal timer for this NOTIFY messages?
> -
>
> in a production enviroment?
>
> Thank in advance.
>
> Ricardo Martinez
>
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