asterisk users - Feb 2012 - how many UDP ports is required for 1 call

Hi,

how many UDP ports is required for 1 call. and why .
-- 

Thanks and regards

 Virendra Bhati
+91-8885268942
Software Engineer
E-mail-: virbhati at gmail.com
Skype id:- virbhati2
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On 02/21/2012 07:30 AM, virendra bhati wrote:
>
> Hi,
>
> how many UDP ports is required for 1 call. and why .
A 'call' is too ambiguous to answer your question. Is this a voice call,
a video/voice call, a FAx call, a T.140 text call, or something else?

-- 
Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
Check us out at www.digium.com & www.asterisk.org

As many ports as required by the nature of the call, i.e. the protocol(s) used
for the bearer.

--
This message was painstakingly thumbed out on my mobile, so apologies for
brevity and errors.

Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/, http://www.alexbalashov.com

On Feb 21, 2012, at 8:30 AM, virendra bhati <virbhati at gmail.com> wrote:
> 
> Hi,
> 
> how many UDP ports is required for 1 call. and why . 
> -- 
> 
> Thanks and regards
> 
>  Virendra Bhati
> +91-8885268942
> Software Engineer
> E-mail-: virbhati at gmail.com
> Skype id:- virbhati2
> 
> --
> _____________________________________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
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On Tue, 21 Feb 2012 19:00:48 +0530, virendra bhati
<virbhati at gmail.com> wrote:
>how many UDP ports is required for 1 call. and why .
If you mean a voice call, it appears that each host must open three
UDP sockets:

- One to send/receive SIP commands
- Two to receive sound (one for RTP, one for RTCP; The first port is
even, the other is odd)

http://www.cs.columbia.edu/~hgs/rtp/faq.html#ports

www.freecode.com/articles/nat-traversal-for-the-sip-protocol
(great article, but missing images)

"Understanding the relationship between SIP and RTP"
http://blog.lithiumblue.com/2007/07/understanding-relationship-between-sip.html

>
> <virbhati at gmail.com> wrote:
> >how many UDP ports is required for 1 call. and why .
>
> If you mean a voice call, it appears that each host must open three
> UDP sockets:
>
> - One to send/receive SIP commands
> - Two to receive sound (one for RTP, one for RTCP; The first port is
> even, the other is odd)
>
This is I think the best answer provided to you so far. The simplest and
most relevant I should say. Just to add to that, first port is TCP port and
the other two are UDP ports assuming you are using SIP protocol.

-Bruce
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