Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

The following hardware trace on the Cisco Catalyst 6000 8 Port Voice T1/E1 and Services Module, indicates that the E1 port 4/2 in the card has registered as an MTP/transcoder with Cisco CallManager.

greece-sup (enable) sh port 4/2

 

 

 

 

Port Name

 

Status

Vlan

Duplex Speed Type

----- ------------------ ---------- ---------- ------ ----- ------------

4/2

 

enabled

1

 

full

- MTP

 

Port

DHCP

MAC-Address

 

IP-Address

Subnet-Mask

-------- ------- ----------------- --------------- ---------------

4/2

disable 00-10-7b-00-0f-b1 10.200.72.32

255.255.255.0

Port

Call-Manager(s) DHCP-Server

TFTP-Server Gateway

-------- ----------------- --------------- --------------- ---------------

4/2

10.200.72.25

-

 

10.200.72.25

-

Port DNS-Server(s) Domain

-------- ----------------- -------------------------------------------------

4/2

-

0.0.0.0

Port

CallManagerState DSP-Type

-------- ---------------- --------

4/2

registered

C549

Port NoiseRegen NonLinearProcessing

--------------- -------------------

4/2 disabled disabled

Note: The same E1 port cannot be configured for both Conference Bridge and Transcoder/MTP

In order to make a call between two devices using a low bit rate code (such as G.729 and G.723) that do not support the same codec, a transcoder resource is required. Consider the following illustration:

 

Cisco CallManager

D

A

 

 

 

 

 

 

 

IP

E

B

 

WAN

 

 

C

Region1

Region2

F

 

 

 

 

© 2000 Cisco Systems, Inc.

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Cisco Systems 30 VIP manual Region1 Region2

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