Some modems may need initialization strings to connect to some paging carriers. If the modem keeps dialing and connecting, but does not send the message, chances are a modem initialization string is needed. Some common initialization strings are below. If you have a less well known brand modem, you may need to use the documentation with your modem to create an init string. Additional codes forces a 1200 baud connection.
Additional codes turns off error correction and data compression.
Turns off error correction and data compression. Forces a 1200 baud connection. Set the baud rate to 300 when using this string. I have tried the init string but still get inconsistent results. Try setting the baud rate on the carrier setup screen to 19200 and using the init string given to lock the baud rate between the modems to a lower rate.