[cisco-voip] UDP 2000 from SRST router to IP phone?

[Ed Leatherman]

I would think that your IP phone would send to the UDP range 16384-32767 on
the gateway for RTP traffic rather than port 2000. It sounds like the call
is already setup.


On 7/5/07, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
>
> That's was our understanding, TCP 2000.
>
> I don't think we've ever heard about the sequential ports though. We've
> only
> opened up TCP 2000.
>
> ----- Original Message -----
> From: "Matt Slaga (US)" <Matt.Slaga at us.didata.com>
> To: "Paul Choi" <asobihoudai at yahoo.com>; "Lelio Fulgenzi"
> <lelio at uoguelph.ca>; <cisco-voip at puck.nether.net>
> Sent: Thursday, July 05, 2007 9:09 PM
> Subject: RE: [cisco-voip] UDP 2000 from SRST router to IP phone?
>
>
> > Cisco contends that SCCP uses TCP 2000 - 2002 (one port for each
> > CallManager in it's failover list).  Not sure about UDP 2000.
> >
> > -----Original Message-----
> > From: cisco-voip-bounces at puck.nether.net
> > [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Paul Choi
> > Sent: Thursday, July 05, 2007 9:01 PM
> > To: Lelio Fulgenzi; cisco-voip at puck.nether.net
> > Subject: Re: [cisco-voip] UDP 2000 from SRST router to IP phone?
> >
> > I could be full of shit but I'm pretty sure that SCCP
> > uses UDP 2000 to communicate with CCM.
> >
> >
> > --- Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
> >
> >> We're just setting up some ACLs and found that while
> >> in SRST mode, the SRST router (or at least the
> >> loopback address that we bind MGCP to) tried to
> >> communicate to the IP phone that was registered. We
> >> had not allowed for this and as a result, the call
> >> out the gateway was one way audio. But we didn't see
> >> any other denies come out of the logs.
> >>
> >> I see that in the SRST config, it asks for a port,
> >> and it is 2000. But it's still wierd to see UDP 2000
> >> being used.
> >>
> >> Can anyone comment?
> >>
> >> 2d08h: %SEC-6-IPACCESSLOGP: list voice_in_kc denied
> >> udp 10.104.122.141(17624) -> 10.104.34.48(2000), 1
> >> packet
> >>
> >>    ^- IP phone              ^- SRST router
> >>
> >>
> >>
> > ------------------------------------------------------------------------
> > --------
> >> Lelio Fulgenzi, B.A.
> >> Senior Analyst (CCS) * University of Guelph *
> >> Guelph, Ontario N1G 2W1
> >> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> >>
> > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> >>
> >> "Buffalo buffalo Buffalo buffalo buffalo buffalo
> >> Buffalo buffalo."      WJR
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> >
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-- 
Ed Leatherman
Senior Voice Engineer
West Virginia University
Telecommunications and Network Operations
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