Well folks, after all was said and done it turns out that the problem was in
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Drum roll please.
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The MerMail!!
Yep. This was a strange one to me. When I looked at the messaging stream on the maintenance terminal all that the PBX was receiving from the PMS for close to 2 weeks was PT [STX]IS TEST[ETX] [BCC]. Which, of course, the PBX acknowledged.
Today I put the RSM in bypass and immediately began seeing different messaging. I at first thought that the PBX was finally receiving the update data from the PMS.
I soon noted that there was only one message repeating over and over:
PT [STX]SE CP Z9315 "JODI PORTUGAL'S BABY SH" 23 LA 0 ETX][BCC]
MT [NACK]
MT [STX]MNEMONIC[ETX][BCC]
MT [STX]MNEMONIC[ETX][BCC]
MT [STX]INPUT ERROR[ETX][BCC]
I put the RSM back into normal mode and saw no change in the new errors.
The IT Manager told me that their PMS vendor said that they were only seeing a partial link with the PBX.
I rebooted the MerMail.
I now see the following messaging:
PT [STX]SE ST <room DN> CH OU (or IN) [ETX][BCC]
MT [ACK]
and
PT [STX]SE CP <room DN> <Name> [ETX][BCC]
MT [ACK]
as well as what I was seeing before:
PT [STX]IS TEST[ETX] [BCC]
MT [ACK]
and
MT [STX]ST <ROOM DN> PR MI 0[ETX]
PT [ACK]
All of which I would expect to see. I'll be monitoring the messaging over the next few days to see if the problem returns.
Thanks for all of the good suggestions and encouragement.
