[SIP] Connections in a nutshell?

[SIP] Connections in a nutshell?
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Subject Author Date
[SIP] Connections in a nutshell? Vincent Delporte 08-04-2006
Posted by Vincent Delporte on August 4, 2006, 6:48 pm
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Hello

        I'm currently setting up Axon PBX on a W2003 server, but would
like to know how SIP/RTP works as far as ports are concerned.

When setting up Axon, it requires opening the following UDP
ports/range:
5060
5070
8000-8020 (for ten extensions)

I seem to understand that SIP clients that need to register (either
local phones, or road warrior with a hard/softphone) do this by
connecting to UDP 5060.

OTOH, I don't know what 5070 is for, and how things work for RTP with
8000-8020: If RTP connections are peer-to-peer, ie. phone to phone,
why does the PBX need to open up ports?

Can someone tell me how the whole thing works? Some diagram of who
calls what how?

Thank you.

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Posted by Jonathan Roberts on August 4, 2006, 8:47 pm
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> OTOH, I don't know what 5070 is for, and how things work for RTP with
> 8000-8020: If RTP connections are peer-to-peer, ie. phone to phone,
> why does the PBX need to open up ports?

My guess is that they actually want you to open 5060 THROUGH 5070. I'm not
familiar with the other block.



Posted by Vincent Delporte on August 5, 2006, 1:41 am
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On Fri, 4 Aug 2006 19:47:27 -0500, "Jonathan Roberts"
>My guess is that they actually want you to open 5060 THROUGH 5070. I'm not
>familiar with the other block.

No, they seem to require UDP 5060 and 5070 for SIP, and ports starting
from UDP 8000 for RTP connections (by default, 8000-8020 for ten
extensions.)

But regarless of the number of ports, I'm in the dark when it comes to
the client-server registration, followed by how clients talk to each
other, who calls who, etc.

Posted by Jonathan Roberts on August 5, 2006, 10:29 am
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> On Fri, 4 Aug 2006 19:47:27 -0500, "Jonathan Roberts"
> >My guess is that they actually want you to open 5060 THROUGH 5070. I'm
not
> >familiar with the other block.
>
> No, they seem to require UDP 5060 and 5070 for SIP, and ports starting
> from UDP 8000 for RTP connections (by default, 8000-8020 for ten
> extensions.)
>
> But regarless of the number of ports, I'm in the dark when it comes to
> the client-server registration, followed by how clients talk to each
> other, who calls who, etc.

I found this relating to Axon specifically
http://nch.invisionzone.com/index.php?showtopic=737. Also, you might want
to poke around http://www.voip-info.org/wiki/ for general info.

Jonathan



Posted by Vincent Delporte on August 5, 2006, 5:17 pm
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On Sat, 5 Aug 2006 09:29:00 -0500, "Jonathan Roberts"
>I found this relating to Axon specifically
>http://nch.invisionzone.com/index.php?showtopic=737. Also, you might want
>to poke around http://www.voip-info.org/wiki/ for general info.

Will do. I had already read that article on the Axon forum, but it
doesn't explain how the ports are used (eg. how are the RTP ports used
: at random? etc.). I'll go see if I can find more on the second site.
Thank you.

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