Paolo's earlier response about the posting rating higlights something that all people asking for assistance need to understand.
If you want a good answer, you need to give a good problem description.
Many of the people who donate their time and expertise on these forums are able to give immediate solutions provided they have an understanding of the problem. If the intial problem description is vague, then the answer may be similarly vague and possibly not what was wanted.
When anyone posts a question on Netpro, write it up from the point of view that if someone asked you a technical question , what would you want them to provide so you can give a solution ?
In other words, tell us -
A detailed description of what you want the system to do
How you want it to work
A detailed description of the fault
Did the system ever work ? If so , what changed ?
If there is a problem, when does it happen?
Is there a trigger to make the problem happen
What have you already tried to rectify the problem ?
IOS versions, configs from equipment and any background details that may be relevant.
Here is the original problem description -
my company needs to support the customers through dialup connections and there is no any analog phone line ready.
can any one help me how i can use the modem relay or any thing to solve this problem.
i have 2811 gateway.
Unfortunately this doesn't tell us a lot about what you really want to do.
To give you a proper answer, we need to know -
How many modem calls do you need to handle on the system ?
Do you want to originate dial connections from the router ?
Do you wish to terminate dial connections directly on the router ?
Do you want the modem calls to transit the router to remote dial up modems via modem passthrough or modem relay ?
If you want to use modem relay/passthrough, what kind of latency and bandwidth does the connecting network have ?
What speeds do you expect the modems to work at ?
Do you have analogue (loop start) lines , or digital connections ?
If it is digital, do you have T1, E1 or ISDN Basic Rate connections ?
If you use T1 or E1, is it CAS or PRI?
So ... if we had all this kind of information in the original posting, quite possibly someone here could provide a reply that would rate a 5.0!
For anyone reading this, please keep these points in mind when you write up your questions - the more detail you can give, chances are you will get the right answer.
In the meantime, perhaps the new PVDM2 digital modems might be what you are looking for -
http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a00806b941f.html
These new modem modules allow you to terminate and originate modems calls through digital trunks (E1, T1, BRI) directly on the router. The digital modems can be shared with normal voice calls if you also have PVDM2 voice modules installed - you use modem pooling to associate the modems to specific DNIS (called numbers) , the voice calls are directed to normal dial peers.
There are also analogue modem WIC's that will terminate a loop start analogue line on the router -
http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00806c5807.html
The comm port redirectors that Paolo suggested earlier are very useful in these kind of applications to redirect comm port traffic as telnet sessions direct to the router, the modems then pass the traffic as necessary.
If you want to use modem passthrough, remember you need a matching voip capable device with voice ports (router with FXS ports, ATA etc ...) to connect the remote modems to the IP network. Therefore it often makes sense to terminate the modems directly on the router using the digital modem modules instead of tunneling the calls across the IP cloud.
