Routing GSM data calls to tcp/ip based servers

[onur.yildirim]

Hi,

We want to implement data exchange between GSM enabled simple devices and our application servers. These devices won't have a TCP/IP stack, they will be only capable of establishing basic serial communication to transfer a small amount of data. Devices will make v.110 data calls and we are planning to use Cisco AS series equipment to receive the calls. As mentioned earlier, the device does not have a TCP/IP stack and we cannot use PPP.

So, is it possible to configure the Access Server to route basic RS232 signals encapsulated in v.110 to a predetermined IP address and a port number? If not, is there any other way to transfer data between the endpoints without implementing TCP/IP on the device?

Thanks in advance.

[tepatel]

I am sure application servers supports TCP/IP. So you can use "autocommand telnet " command under the line config of Access Server. So that once GSM device dialin to Access Server and DSR goes high after successful modem connection, access server will execute that autocommand and will establish tcp connection to server's ip specified.

So TCP connection will be between Access Server and application server while GSM user will have a serial async connection to access server.

Here is the url which talks about that for line 3 to 5.

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_configuration_example09186a00800b4c51.shtml

[onur.yildirim]

Thanks for the reply, it indeed removed the clouds for us.

Our application server will support TCP/IP. Another question though, once the connection is established, is there anything tricky about how the server will respond to the device?

Thanks in advance.

[tepatel · Accepted solution]

No. Once the connection is established, access server becoms transparent. Two devices will talk end-to-end.

You might need to use "service tcp-keepalive" command to clear hing tcp session automatically. Visit following url for more.

http://www.cisco.com/en/US/tech/tk801/tk36/technologies_tech_note09186a00801365f3.shtml

[onur.yildirim]

Hi Tejal,

Thank you very much for previous responses.

Is it possible to use Cisco 3600 series equipment to establish the same setup?

We are considering Cisco 3620 or Cisco 3640 with digital modem cards. Could you please advise a minimum cost setup for 10 maximum simultaneous connections?

Thank you very much in advance.