asterisk users - Nov 2005 - Narrowing RTP port range

Hello everyone..

I'm trying to lock down my asterisk install as much as possible and I
keep reading about people saying 'you can narrow the range of ports in
rtp.con' (by default it's from 10000 to 20000 I think).

My question is this - how much can I narrow it down?  Can I narrow it to
10 ports, or can the ports not be reused for additional conversations?

I guess what I'm asking is - does the number of ports in the range have
anything to do with the number of simultaneous connections or anything
like that?

Thanks again,

tf.

We have done this before but we had to do go back to 10000-20000. This
should have not caused a problem but, we had a lot of call quality problems
when we had it set to 10000-10500 and only had 7 ext on the server.

Just my two cents 

-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Tyler
Sent: Friday, November 25, 2005 12:36 PM
To: asterisk-users@lists.digium.com
Subject: [Asterisk-Users] Narrowing RTP port range

Hello everyone..

I'm trying to lock down my asterisk install as much as possible and I
keep reading about people saying 'you can narrow the range of ports in
rtp.con' (by default it's from 10000 to 20000 I think).

My question is this - how much can I narrow it down?  Can I narrow it to
10 ports, or can the ports not be reused for additional conversations?

I guess what I'm asking is - does the number of ports in the range have
anything to do with the number of simultaneous connections or anything
like that?

Thanks again,

tf.



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> I'm trying to lock down my asterisk install as much as possible and I
> keep reading about people saying 'you can narrow the range of ports in
> rtp.con' (by default it's from 10000 to 20000 I think).
> 
> My question is this - how much can I narrow it down?  Can I narrow it to
> 10 ports, or can the ports not be reused for additional conversations?
> 
> I guess what I'm asking is - does the number of ports in the range have
> anything to do with the number of simultaneous connections or anything
> like that?
Yes, you can narrow it down. One port will be required for each
leg of a call. So if sip/123 called sip/345, that's two ports. I'd
suspect that some ports are used for other purposes besides just a
conversation, so adding more is certainly more in your best interest
then cutting them short.