I have 2 offices connected via a T1, currently used for data only. Each end has a Cisco 2621 with a WIC-1T for the T1 termination. Ethernet is connected to a LAN on each end. Each office also has a Mitel PBX. I would like to combine voice and data on the T1 between offices, giving 12 channels each to voice and data.
Can I put a VWIC-2MFT-T1-DI in each of the 2621's and do this, connecting one port to the PBX and one port to the T1? In the documentation I have read it is not clear if I can insert the LAN data from the ethernet port into the T1 using this method, or if I would need a Digital T1 Packet Voice Trunk Network Module.
The voice traffic is only going PBX to PBX. PBX interface on each end is D4(SF) AMI E&M.
Also you don't have to divide it into voice and data, use the whole T1 for both, using LLQ to provide qos for the voice traffic. Using vad in combination with the voice vad-time command will give you almost all the bandwidth for data when voice is not active, voice will only use the BW when calls are active.
Since my original post a few months ago I've made some changes to the configuration & now have it up and running. I have the relevant portions posted below for the benefit of other readers.
The TDM group under each controller carries the voice data from the main office PBX to the branch office PBX. The crossover of the voice traffic is made with the "connect" statement.
The serial interface is assigned to channels 13-24 (768K) of the T1 with the "channel-group 0" command. Note that the default speed per channel is 56K. 64K must be specified to get the maximum bandwidth.
I went with this configuration to avoid the hardware cost involved in the network voice modules. The tradeoff is that my bandwidth is fixed at 768K for voice and 768K for data. A packetized voice solution would allow this to change dynamically.
Both the data & voice have been very stable on the T1 since I've implemented this solution. I'm saving a bunch of Telco trunc costs at the remote office and have increased my bandwidth to 768K between offices.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...