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NowSMS Support Forums ⬆ NowSMS Support - SMS Issues ⬆ Archive through November 14, 2013 ⬆ |
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Author | Message | |||
Tim Williams New member Username: Timw Post Number: 47 Registered: 09-2010 |
Hi, We have noticed issues where the silent SMS sent through to activate IMessage/Facetime on the Iphone etc do not work - we are seeing them in the SMSIN logs as standard text SMS - as such when they get to the handset they just appear as a block of text. Is this a known issue and/or any way to resolve it? | |||
Des - NowSMS Support Board Administrator Username: Desosms Post Number: 4701 Registered: 08-2008 |
Hi Tim, This suggests that some advanced attribute of the message is getting lost or corrupted somewhere during transit. It could be when it passes through NowSMS ... but more likely it is an issue with one of the SMSC connections involved. Most likely a PID or DCS value getting modified (or perhaps UDH). I assume the message is coming to you from an SMPP client connection (deliver_sm?) and then being routed to an upstream SMPP connection (submit_sm). It would be interesting to see the PID, DCS and UDH values recorded in SMSIN & SMSOUT. I am assuming they will be the same (and that the message data is the same in both). But that's not to say that those values don't get changed before or after passing through NowSMS. There is a tendency for systems to ignore or discard unexpected PID or DCS values. A Wireshark trace might be helpful. -- Des NowSMS Support | |||
Des - NowSMS Support Board Administrator Username: Desosms Post Number: 4702 Registered: 08-2008 |
I did a little more investigation. PID and DCS may not be the issue. From what I've been able to gather, the most common source of this problem is source/destination address changes. Specifically for the message coming back from Apple, the phone needs to see this source address as matching the number that the phone sent the activation request to. -- Des NowSMS Support | |||
Tim Williams New member Username: Timw Post Number: 49 Registered: 09-2010 |
Hi Des, I found out it was the UDH not being passed through correctly - now resolved and working fine. Thanks for the assistance. |