Wednesday, November 21, 2018

TDM over IP between ASR and ISR

I have a customer who has a large land mobile radio fleet with multiple radio repeater sites. They backhaul (via channelized T-1) the radio traffic to a voter to pick the best audio to retransmit.

This channelized T1 runs over a TDM microwave link. The customer is interested in adding a redundant T1 connection that doesn't rely on the microwave radio.

I have a simple LDP MPLS network between those sites running on catalyst 3650 / 3850 switches (so no FRR or BFD or TE). At one side I have an ASR 1001-x with the ability to accept a T1. On the other end of this MPLS network I have a ISR 4331 with a spare T1 port.

Is there a way to create a psudowire or other Cisco based TDM emulation between those devices? I don't see how to do that on a ISR. Do I need to have voice licensing or something?

What if I stick an ASR 90x series in place of the ISR?

How bad of an idea is this?



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