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Brian.Turner



Joined: 29 Jun 2004
Posts: 26
Location: Atlanta

PostPosted: Fri Jul 25, 2014 10:40 am    Post subject: MultiTech MultiModem Cell on Verizon Reply with quote

We have a MultiTech MultiModem Cell cellular modem connected to the Verizon network. We have frequently seen dropped and duplicate messages that have been sent out on this modem via PageGate. This was most likely to occur when sending a large message that had to be "chunked" into smaller messages (1 of 2, 2 of 2) by PageGate or in high volume usage.

To diagnose the problem, we researched the AT command set specific to this modem. We discovered the following in the documentation for the AT+CMGS instruction:

"It is recommended that +CDS: unsolicited messages are enabled using the AT+CNMI command. +CDS: indicates that the message has been received by the network and the network is delivering the SMS or there is an error in attempting to send the SMS. Attempting to send a second SMS prior to the +CDS: unsolicited message will result in an error."

We wrote a short utility program that talks to the modem directly. It sends 5 messages to the modem. In between messages, it always waits for the "OK" from the +CMGS call, then either waits for +CDS or delays a specified number of seconds. When we call AT+CNMI and wait for the CDS notification in our program, we have never lost a message or gotten duplicates. When we don't wait for CDS, but instead delay, we have no guarantee of success, and have had errors with delays of 3 seconds during high volume times.

It seems that +CNMI isn't a standard part of GSM AT - at least, it returns an error when we try to run it against our T-Mobile modem - and so I'm guessing that PageGate isn't using it or checking for the CDS notification. However, not having it is starting to cost us customers because of missed messages.

Would it be possible to get a patch for this? We are running PageGate 6.

Thanks.


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Tech Support



Joined: 25 Aug 2003
Posts: 4041

PostPosted: Fri Jul 25, 2014 11:22 am    Post subject: Reply with quote

We have created a patch to attempt to accommodate that behavior. Can you email support@notepage.com so we can work more directly with you and send you some files?

Thanks



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Brian.Turner



Joined: 29 Jun 2004
Posts: 26
Location: Atlanta

PostPosted: Fri Jul 25, 2014 11:31 am    Post subject: Reply with quote

I just e-mailed support with the same subject line. I'm looking forward to trying the patch.


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PostPosted: Mon Jul 28, 2014 12:37 pm    Post subject: Reply with quote

Just to make a followup post to this thread, a solution has been coded and is being included in the most recent installation of PageGate.



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