cisco router to router dialup modem connection

If the routers do not have a telephone jack with an internal modem, I do not see how you could do this.

There was an SMC Barricade box that was a Router with a modem and telephone jack. I had one and used where the only service was phone and the client needed multiple (two) computers connected at the same time.

But I do not know if that device is an longer available. It was very low tech a decade ago.

Here is something that might work for you.

http://www.perle.com/lp/ethernet-modem.shtml?gclid=CjwKEAiAt4mlBRDXwt_m9ICU4DcSJAAS_X0WEMC2ltBNRrl7rFi8dGrRckGCNWQNNT2kdH7MQ_emnxoCxyDw_wcB

Also, are you in an area with cellular capability?  If so, ISP's provide Internet Hotspots with Ethernet output internally. Two sites with these could connect via Internet which would make more sense for you if you have cellular capability.

If you really need to do it that way, find a couple of refurbished Cisco 2511 routers and use external modems with them (they were designed for dial-up access using external modems).  I only used them for incoming (not outgoing) modem access, but you should be able to figure out a way to have them dial out.  Again, this is old technology as I used these back around 1995 when I had an ISP business before the days of broadband.  I think the routers are still around in the $200 price range.  If you get some, make sure you get the modem cables with them.

Thank for your responses and I should have been more clear on my request.  I have two cisco 2821 routers and each have a wic-1am-v2 modem card installed.  I"ve also been able to setup external modems and have them dial and telnet with each other.  What I'm having trouble with is a solid connection between the two that I can route traffic through.  I've read several articles about backing up a serial connection with modems but it usually turns into ISDN.  What I have running on these two routers is GRE vpn tunnel to connect the two via cable internet modems.  Works well until one of the connections goes down (yea, should be a lease line, I know).  That's were I'd like to have a dial up modem to dial up modem connection between the two.  I haven't seen much in config options for doing that and was hoping someone here might have done this in the past.  I know it's old tech, and I do have a failover via cellular internet access and cradlepoint that works rather well, however, we have to have a connection option at any level or business stops.

Are the modems POTS or ISND?   For POTS, I typically did an ATZ to reset the modem before dialing with ATDT. There were modem parameters for flow control, bits, parity and duplex but I no longer have a record of those.

I do have a failover via cellular internet access and cradlepoint that works rather well  <-- It is 2015 tomorrow. Is this not your answer?

Pots line and I understand the at commands.  What I'm looking for is a setup for routing traffic through the connection.

If the connection is made, and if you set up a TCP/IP connection (SLIP) then there should not be much routing to do.

I'm thinking there's more to it then that.

That is all there was to it in the days of dial up Internet. Modem, Trumpet Winsock, and SL/IP interface.

I think what you have forgotten is that connections today are TCP/IP and a straight modem to modem connection is NOT TCP/IP. Add to that (from above) the typical failure point above was the modem.

One of the problems with dialup connections is that they generally disconnect when there is no traffic for a period of time.  So if you are trying to keep an open line, much like you do with a broadband or T1/T3 connection, it won't happen very easily.  When there is a disconnect, you'll have to initiate a reconnect the next time you want to send data.  That may happen in either direction, in this case, whereas with the old dialup days, all connections were initiated by dialup users.  The routers never dialed them.  The other problem is hung modems.  Modems have a tendency to hang if not disconnected properly.  I remember when I was running a small ISP business back in those days, I constantly had to physically reset modems that had become hung, and wouldn't answer incoming calls.  That's why many businesses went to ISDN lines before broadband connections becamse available.

I'm actually speaking with Cisco tech support and there is way more to this then I had imagined.  Please close and/or delete this thread.

It took a lot of sources to get the final working code.