[cisco-voip] Echo / Feedback on 7940 and CCM 4.1(3)

Tue May 2 22:21:35 EDT 2006

Have you taken a look at port statistics?  Is there lots of unnecessary
traffic that may be interfering?

Also, Cisco puts a lot of push into their QoS.  The 3524's, by your configs,
don't seem to offer a lot in the area of QoS when compared to the 3550's and
3750's.  Getting a switch that allows you to run 'macro .. cisco-phone' for
auto-configuring QoS goes a long way to making a good sounding phone.  

I found that the hard way when I forgot to set QoS settings on a port
connected to a Unity server.  Without the proper propogation and trust of
QoS, Unity sounded pretty bad on the other side of WAN link.  When I set the
proper port QoS, things improved.  

However, I'm just muttering about standard things.  Perhaps there is
something else on your network that may be the cause of this.

  _____  

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Darren Smith
Sent: Tuesday, May 02, 2006 23:02
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Echo / Feedback on 7940 and CCM 4.1(3)

Hi, 

I have 2 users complaining of feedback / Echo on 2 Cisco 7940 phones. 
The phones are connected to a Cisco Catalyst 3524XL-PWR switch, along with
20 other 7940's. 
No other users on this switch are experiencing any issues. 

I have replaced one of the phones, but the issue is still there. 

The switch is running IOS ver c3500xl-c3h2s-mz.120-5.WC03, I noticed the
latest version is c3500xl-c3h2s-mz.120-5.WC14 which I can only upgrade to
out of hours.

Is there anything else I can check to resolve this issue? 
Switch Config is pasted below: 

Thanks 

Darren Smith 
----------------------------------------------------------------------------
--------- 

Current configuration: 
! 
! Last configuration change at 16:53:06 Brisban Tue May 2 2006 
! NVRAM config last updated at 08:35:28 Brisban Wed May 3 2006 
! 
version 12.0 
no service pad 
service timestamps debug datetime msec localtime 
service timestamps log datetime localtime show-timezone 
no service password-encryption 
! 
hostname goldcoast-sw-3524-5 
! 
aaa new-model 
aaa authentication login default enable 
aaa authorization exec default if-authenticated 
enable secret 5 *********************** 
! 
username silver privilege 15 password 0 ************** 
! 
! 
! 
! 
clock timezone Brisbane 10 
! 
ip subnet-zero 
! 
! 
! 
interface FastEthernet0/1 
 description Apartment 27 
 switchport trunk encapsulation dot1q 
 switchport trunk native vlan 127 
 switchport trunk allowed vlan 1,3,127,1002-1005 
 switchport mode trunk 
 switchport voice vlan 3 
 switchport priority extend cos 0 
 spanning-tree portfast 
! 
interface FastEthernet0/2 
 description Apartment 39 
 switchport trunk encapsulation dot1q 
 switchport trunk native vlan 139 
 switchport trunk allowed vlan 1,3,139,1002-1005 
 switchport mode trunk 
 switchport voice vlan 3 
 switchport priority extend cos 0 
 spanning-tree portfast 
! 
! 
interface FastEthernet0/12 
 description Apartment 44 
 switchport trunk encapsulation dot1q 
 switchport trunk native vlan 144 
 switchport trunk allowed vlan 1,3,144,1002-1005 
 switchport mode trunk 
 switchport voice vlan 3 
 switchport priority extend cos 0 
 spanning-tree portfast 
! 
interface FastEthernet0/13 
 description Apartment 33 
 switchport trunk encapsulation dot1q 
 switchport trunk native vlan 133 
 switchport trunk allowed vlan 1,3,133,1002-1005 
 switchport mode trunk 
 switchport voice vlan 3 
 switchport priority extend cos 0 
 spanning-tree portfast 
! 
interface FastEthernet0/14 
 duplex half 
 speed 10 
 switchport access vlan 3 
 switchport trunk allowed vlan 1,3,1002-1005 
 spanning-tree portfast 
! 
interface FastEthernet0/15 
 description Apartment 34 
 switchport trunk encapsulation dot1q 
 switchport trunk native vlan 134 
 switchport trunk allowed vlan 1,3,134,1002-1005 
 switchport mode trunk 
 switchport voice vlan 3 
 switchport priority extend cos 0 
 spanning-tree portfast 
! 
interface FastEthernet0/16 
 switchport access vlan 3 
 switchport trunk allowed vlan 1,3,1002-1005 
 switchport voice vlan 3 
 spanning-tree portfast 
switchport priority extend cos 0 
! 
! 
interface GigabitEthernet0/1 
 duplex full 
 switchport trunk encapsulation dot1q 
 switchport trunk allowed vlan 1,3,98,127-144,1002-1005 
 switchport mode trunk 
! 
interface GigabitEthernet0/2 
 shutdown 
 switchport trunk allowed vlan 1,1002-1005 
! 
interface VLAN1 
 ip address 10.3.15.103 255.255.255.0 
 no ip directed-broadcast 
 no ip route-cache 
 shutdown 
! 
interface VLAN98 
 ip address 172.16.3.46 255.255.255.224 
 no ip directed-broadcast 
 no ip route-cache 
! 
ip default-gateway 172.16.3.33 
! 
line con 0 
 transport input none 
 stopbits 1 
line vty 0 4 
 privilege level 15 
line vty 5 
 privilege level 15 
line vty 6 15 
! 
ntp clock-period 11259183 
ntp server 172.16.9.1 
ntp server 172.16.9.2 
end 

goldcoast-sw-3524-5# 

  _____  

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