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

Wed May 3 03:21:46 EDT 2006

Hi,

To answer your questions:
1 - The user hears themselves twice, but the the remote user cannot hear
anything unusual.
2 - The echo does not occur on "on net" calls, only when they pass to
the PSTN, and then on local, national and mobile calls. (Both inbound
and outbound). The gateway is a Cisco AS5350.
3 - No, between IP phones on our network is fine. When the user
experiences this, they say that the next call is ok, no echo.,

Thanks

Darren

________________________________

From: Fedorov, Konstantin [mailto:kfedor at amt.ru] 
Sent: Wednesday, 3 May 2006 5:17 PM
To: Darren Smith; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Echo / Feedback on 7940 and CCM 4.1(3)

Hi,

To answer you question, you must understand where is the source of Echo.

And what kind of Echo you have.

1.	Does you users hear yourselves or twice remote user ?? 
2.	When echo appears ? Where the user call - long distance call or
local ?? 

Does a call exist the VoIP ?? if yes, what is the gateway

3.	Is Echo between two IP phones ?? 

When you replace phone, the problem with the same holder of phone, does
it ? 

Here the link where you could find useful info.

http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a
0080149a1f.shtml

-----------------------
Sincerely Yours,
Konstantin Fedorov

________________________________

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Darren Smith
Sent: Wednesday, May 03, 2006 6:02 AM
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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