[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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>  >  >>
>  >  >>
>  >  >
>  >  >
>  >  >
>  >
>  >
>  >
>  >
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