IPT issue

Unanswered Question
Jun 17th, 2008
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Hi all,

sort of a non technical way of askin..am facing an issue with my ip phone registered with the remote data center call manager..i'm able to hear what the other side is talkin, but they are not able to hear what am talkin..there are not routing issues as far as i know..

please put in your comments on possible areas to check..


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zanub Tue, 06/17/2008 - 19:52
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hey all,

this is the config used in the port connecting the ip phone..

interface FastEthernet0/41

description End User Connection

switchport trunk encapsulation dot1q

switchport trunk native vlan 80

switchport trunk allowed vlan 80,90

switchport mode trunk

mls qos trust device cisco-phone

mls qos trust cos


and the belwo are the vlan configs

interface Vlan70

description Transit_VLAN

ip address

standby timers 1 3

standby 70 ip

standby 70 priority 110

standby 70 preempt


interface Vlan80

description Data_VLAN

ip address

ip helper-address

standby timers 1 3

standby 80 ip

standby 80 priority 110

standby 80 preempt


interface Vlan90

description VOICE_VLAN

ip address

ip helper-address

standby timers 1 3

standby 90 ip

standby 90 priority 110

standby 90 preempt


the phone is working(can hear only one side though) only when i configure it in data vlan range..with vvlan 90 ip addr, not even able to ping.


Tim Smith Wed, 06/18/2008 - 02:02
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You need to verify your routing and security setup here.

If you can not ping from voice vlan, then either your routing is not right. Or you have a firewall in between, and it is blocked.

Either way, you need to verify routing and whether there are any firewalls in between and whether they are configured correctly.




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