BCM50 Issue - DN Issue

[adamf53]

Hello;

We recently installed a BCM50 to replace a 450 and are having only 1 issue. Just as a background this system has a local PRI and is connected to a gigabit LAN and talks to the CS1000 over a dedicated T1 network.

Our issue is that at this site, for no apparent reason, a user's 1140 IP Phone will say "Line in use by xxxx" where xxxx is another extension in that office.

The only thing in the alert log is a round trip delay message stating that the RTD was 42ms. Our network averages 20ms and is RARELY congested. QoS is setup to allow voice priority obviously but I keep thinking this issue is local.

Has anyone had any similar issues? Suggestions?

 

[DBrewsky]

Open up BCM Monitor and see if you see lines busy. Also, what version of BCM50 are you running?

--DB

http://support.csctech.us

 

[adamf53]

Version 6.0.2.05.237

BCM monitor doesn't show any lines busy but will check the next time it is reported so I can look at that exact moment.

 

[DBrewsky]

Is that release 3.0?

--DB

http://support.csctech.us

 

[adamf53]

Yes sir

 

[DBrewsky]

When you mention QOS, are you using QOS in the data switch? If so, are you using it as port based, VLAN based?

--DB

http://support.csctech.us

 

[adamf53]

Port Based QoS in the LAN & also WAN QoS on the cisco Routers.

Below is an example of a port with an 1140;


interface GigabitEthernet0/9
switchport mode access
switchport access vlan 2
switchport voice vlan 55
mls qos trust cos
spanning-tree portfast

 

[adamf53]

I gave you a config from a wrong switch, here's the correct;

interface GigabitEthernet0/19
switchport access vlan 114
switchport mode access
switchport nonegotiate
switchport voice vlan 170
priority-queue out
mls qos trust dscp
spanning-tree portfast

 

[DBrewsky]

Ok. The IP phones use DSCP natively (using code point 40). You can set up QOS based upon that as well.

Let us know what you find regarding the BCM Monitor.

--DB

http://support.csctech.us