[cisco-voip] Strange intermittent MoH problem
Erick Bergquist
erickbee at gmail.com
Thu Apr 3 19:23:47 EDT 2008
Well, the strangeness continues to happen infrequently. I set up
sniffer and tried to duplicate it and was not able to, then it
happened.
On Wed, Apr 2, 2008 at 2:11 AM, Erick Bergquist <erickbee at gmail.com> wrote:
> Well, theres only one CM set for multicast MoH with Mcast address
> configured. I did some snooping and found something else on network
> using same range as MOH Mcast range at times. So changed the CM MoH
> mcast IP address and also base RTP port to something unique and not
> default and we'll see what happens.
>
> But, still doesn't explain why one would hear a unicast call from
> another server while on hold. I would suspect that if 2 devices were
> streaming to same mcast address and port # then the MoH may be mixed,
> silent, sound like garbage, but not mixed in with another call.
>
> So, in wait and see mode. It happens infrequently and I can't get it
> to happen when I try to get it to break.
>
>
>
> On Tue, Apr 1, 2008 at 6:01 PM, Tim Reimers <treimers at ashevillenc.gov> wrote:
> >
> >
> >
> >
> > True... but there's something strange happening at the mcast layer, and it's
> > GOT to be at that layer I think, given that it's:
> >
> > - multiple phones
> > - multiple servers handing out the mcast streams
> > - various times
> >
> > The only core area where I can see commonality in every case is the
> > switching... considering what I've understood about the problem...
> >
> > I shall be _most_ curious to understand what level of evil magic-user spell
> > it took to accomplish this effect!
> >
> >
> >
> > -----Original Message-----
> > From: Ryan Ratliff [mailto:rratliff at cisco.com]
> >
> > Sent: Tue 4/1/2008 5:19 PM
> > To: Erick Bergquist
> > Cc: Tim Reimers; cisco-voip at puck-nether.net
> > Subject: Re: [cisco-voip] Strange intermittent MoH problem
> >
> > I'll reserve judgement until a sniffer capture is done. Even if the
> > unicast RTP stream from MP somehow made it to the wrong IP phone the
> > phone would still have to be listening on that specific RTP port for
> > the user to hear it.
> >
> > -Ryan
> >
> > On Apr 1, 2008, at 5:18 PM, Erick Bergquist wrote:
> > Well, The MP is using Unicast for the conference with ports in 5000
> > range on the MP side and phones are using the normal UDP RTP range.
> > The Mcast MoH is using the usual RTP port range also.
> >
> > On Tue, Apr 1, 2008 at 3:35 PM, Tim Reimers
> > <treimers at ashevillenc.gov> wrote:
> > > That's what I was thinking might be happening.. same IP/port conflict
> > > for some as-yet undetermined black magic reason....
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Ryan Ratliff [mailto:rratliff at cisco.com]
> > > Sent: Tuesday, April 01, 2008 4:25 PM
> > > To: Erick Bergquist
> > > Cc: Tim Reimers; cisco-voip at puck-nether.net
> > > Subject: Re: [cisco-voip] Strange intermittent MoH problem
> > >
> > > Does MP use multicast audio for it's RTP streams? Since each MOH
> > > source gets its own multicast IP address/port if MP is sending
> > > multicast
> > > for a conference (I have no idea if it does this or not) and it
> > > ends up
> > > sending on the same IP/port the MOH server is using then this could
> > > happen.
> > >
> > > I'd work to get a sniffer capture so you can see what the phone is
> > > receiving.
> > >
> > > -Ryan
> > >
> > > On Apr 1, 2008, at 4:26 PM, Erick Bergquist wrote:
> > > The mcast config is normal, nothing special being done outside the
> > > norm.
> > > IP phones hear this as well as outside callers on a H323 gateway
> > > when on
> > > hold sometimes.
> > >
> > > On Tue, Apr 1, 2008 at 3:13 PM, Tim Reimers
> > > <treimers at ashevillenc.gov>
> > > wrote:
> > >> Something in the multicast configuration of the involved layer 2
> > >> devices?
> > >>
> > >>
> > >>
> > >> -----Original Message-----
> > >> From: cisco-voip-bounces at puck.nether.net
> > >> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick
> > >> Bergquist
> > >> Sent: Tuesday, April 01, 2008 4:06 PM
> > >> To: Ryan Ratliff
> > >> Cc: cisco-voip at puck-nether.net
> > >> Subject: Re: [cisco-voip] Strange intermittent MoH problem
> > >>
> > >> Both the music and the MP call, but it is clear and not cutting and
> > >> out every second or so.
> > >> When I've caught it happening, it seems to be calls where MoH is
> > >> playing due to a Network Hold event (parked call, etc). I can't get
> > >> it to happen with a user hold.
> > >>
> > >> On Tue, Apr 1, 2008 at 2:32 PM, Ryan Ratliff <rratliff at cisco.com>
> > >> wrote:
> > >>> IP phones or PSTN calls? Sounds like either crosstalk or a random
> > >>> two devices using the same receive port for RTP and the stream from
> > >>> MP reaching the phone somehow.
> > >>> Do they hear just the MP audio or both MOH and MP audio alternating
> > >>> every second or so? The former is crosstalk, the latter is both
> > >>> RTP
> > >>> streams reaching the phone on the port the phone is listening on.
> > >>>
> > >>> -Ryan
> > >>>
> > >>>
> > >>>
> > >>> On Apr 1, 2008, at 3:07 PM, Erick Bergquist wrote:
> > >>> Anyone ever see people on hold with Multicast MoH (Network Hold it
> > >>> appears to happen with) hear a meetingplace audio conference call
> > >>> while they are on hold? The CCM and MP are seperate servers with
> > >>> different conference bridges so I'm puzzled how the person on hold
> > >>> hears the MP conferences sometimes. It doesn't happen all the time.
> > >>> Is
> > >>
> > >>> real intermittent.
> > >>> The Call Manager is version 4.1(3)sr4d and MeetingPlace Enterprise
> > >> 5.4.
> > >>>
> > >>> Erick
> > >>> _______________________________________________
> > >>> cisco-voip mailing list
> > >>> cisco-voip at puck.nether.net
> > >>> https://puck.nether.net/mailman/listinfo/cisco-voip
> > >>>
> > >>>
> > >> _______________________________________________
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> > >> cisco-voip at puck.nether.net
> > >> https://puck.nether.net/mailman/listinfo/cisco-voip
> > >>
> > >>
> > >
> > >
> > >
> >
> >
> >
> >
>
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