Multipoint videoconference problem

abirsan · ‎12-27-2003

We have in our company(ISP) a videoconference network that consists of 35 videoconference points connected to a central point consisting of a Cisco 7200 gatekeeper, a Cisco IP/VC 3540 videoconference system with a MCU MC06A. The equipment from these 35 points are 23 ViaVideo II systems, 10 PictureTel 550 video systems and 2 PictureTel 600 Series video systems(from 2 main points). Ok. What is the problem? A videoconference session is taking place with all these 35 points connected(without problems). Surposing site number 2(a ViaVideo) is talking with one main site(a PictureTel 600) but suddenly a crashing noise appears(for less than 1 second) and video switchs to another site, for example site number 24. We see that site number 24 doesn't have his microphone connected. After some minutes it happens again and video switchs to another site(only video - audio is muted at that site). Something it's going wrong. All sites have good connection between them.

Any idea what's the matter? Or where I can found exact information about this?

abirsan · ‎12-31-2003

!

! No configuration change since last restart

!

version 12.2

no service pad

service timestamps debug datetime msec localtime show-timezone

service timestamps log datetime msec

service password-encryption

!

hostname Video-GK

!

logging queue-limit 100

enable secret xxxxxxxxxxxxxxxxxxxxxxxxxxx

!

username admin privilege 15 password xxxxxxxxxxxxxxx

clock timezone EET 2

clock summer-time EET recurring last Sun Mar 2:00 last Sun Oct 3:00

clock calendar-valid

ip subnet-zero

!

ip cef

no ip domain lookup

ip domain name xxxxxxxxx.xx

ip name-server x.x.x.x

!

no ip bootp server

!

no voice hpi capture buffer

no voice hpi capture destination

!

mta receive maximum-recipients 0

!

proxy h323

!

interface FastEthernet0/0

description -= Local Switch 2690G Link =-

ip address x.x.x.x 255.255.255.240

ip route-cache same-interface

load-interval 30

duplex full

speed 100

no cdp enable

h323 interface

h323 qos ip-precedence 4

h323 h323-id Video-GK-proxy

h323 gatekeeper id Video-GK ipaddr x.x.x.x

h323 t120 bypass

!

interface FastEthernet0/1

no ip address

shutdown

duplex auto

speed auto

no cdp enable

!

ip classless

ip route 0.0.0.0 0.0.0.0 x.x.x.x

no ip http server

!

no cdp run

!

call rsvp-sync

!

mgcp profile default

!

dial-peer cor custom

!

gatekeeper

zone local Video-GK MTC_Video x.x.x.x

lrq forward-queries

no use-proxy Video-GK default inbound-to terminal

use-proxy Video-GK default inbound-to gateway

use-proxy Video-GK default inbound-to mcu

no use-proxy Video-GK default outbound-from terminal

use-proxy Video-GK default outbound-from gateway

use-proxy Video-GK default outbound-from mcu

no shutdown

!

banner incoming ^C +++ Welcome to Cisco 7200 Video Gatekeeper +++ ^C

banner login ^C +++ Welcome to Cisco 7200 Video Gatekeeper +++ ^C

!

line con 0

stopbits 1

line aux 0

stopbits 1

line vty 0 4

exec-timeout 0 0

login local

!

ntp clock-period 17180162

ntp peer x.x.x.x

!

end

irisrios · ‎12-31-2003

There are 2 modes in which the video switching happens. One does slow switching and the other does fast switching. They are:

SpeakSlct_Fast - Selects fast video-switching mode. This mode is useful when fast and interactive

video switching is required. This is the default mode for the MCU.

SpeakSlct_Slow - Selects slow video-switching mode. This mode is useful when background noise causes

a high level of false video switching sequences. This mode will decrease the number of false

switching events causing the switch to be less sensitive.

You can try one of these modes as per your requirements.

Hope this helps.

abirsan · ‎01-02-2004

Thanks, irisrios. I will try tomorrow. One question: Do I need to execute these commands every time after a reset of the Cisco IP/VC 3540? For example any options modified in the configuration on the Administrator page can be uploaded in the memory just clicking on "Upload". But in this case I'm not sure that IP/VC will remember the new settings after executing the commands to modify switching modes.

abirsan · ‎01-03-2004

irisrios, I tried "SpeakSlct_Slow" and didn't help. Same troubles.

All the configurations - gatekeeper, Cisco IP/VC 3540 are ok. No problems.

I searched many potential sources of the problem but no result. Do you have any idea? Or anybody?