We are having an h323 gateway on a 2811 router, software 12.3(8r)T7, IOS image c2800nm-ipvoice-mz.123-11.T2.bin. We are trying to implement modem passthrough on a few select dial peers.
Problem is that "modem passthrough nse codec g711ulaw redundancy" command is working only on voip dial-peers, not pots dial-peers. Is there any solution?
Don't mention it.
There is no way of applying a codec to a pots dial-peer as you are dealing with devices from the Analog/Digital Telephony era where codecs are not used (although ISDN uses PCM which similar to G.711). You only need to specify codecs in communication between to VoIP devices i.e. Router to Router.