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I have a cisco router, and I need an emergency backdoor to it from a remote site in case the internet connection is down (for any reason). I've connected a good old analog modem to cisco console port by serial cable and I have the similar modem on the client side, connected to a PC and local PSTN line. The problem is: there's no PSTN line on server side. So I've setup a small asterisk box with GSM and FXS modules and a simple route to forward a call from one port to another. The call is passing just fine and server-side modem picks it up. But after a minute or so of trying to handshake it hangs up. Any ideas?

user686946
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You will have 9600 bits connection only in case if ALL following is true

1) you have internet(voip not work without it,right?)

2) ALL path is ulaw or alaw codecs. Any compressed codec will loose data(all codecs are lossly), which will result loss of carrier on modem

3) Fax detect have be turned off(in most cases modem connection will be detected as fax).

There is almost no chance get 14000, any other bitrate is theoreticaly impossible, codecs allow do only voice,not all frequencies and codecs do only 8khz.

arheops
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