Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)
© 2000 Cisco Systems, Inc. 34
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: