Thanks for the response Andreas. I have 2 follow up questions:
1) even though the 7110 is not a heavy duty phone, what could account
for the fact that it is always the phone of operator "A" that has the
problem first? We have swapped the sim cards into different 7110s and
the effect is the same: it is always operator "A" that blocks first.
(does it help if i tell you "A" = "swisscom" :-) ?
The issue here is that when you receive an SMS from the MSC the phone has to reply with an ACK. If you're sending an SMS at the same time, you're getting into trouble. The difference between the operators might be related to the fact that on one operator it takes longer than on others. Also different MSC's act different. We have seen situations like: You send a MT to a MSC which is then in progress of sending it to the phone. While doing that, another MT arrives to the MSC. Some MSCs reject the second, some do simply buffer it.
2) in your opinion, what is a "heavy duty GSM modem"? does anyone else
on the list have an opinion/recommendation for a "heavy duty GSM
modem"? i've seen people mention wavecom before.... ?
We have used a few Siemens TC35 pretty sucessfully for this. We only receive on them. Now we changed to our own MSC emulation infrastructure which makes receiving a lot faster and reliable.
Andreas Fink
Global Networks Switzerland AG
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