[outages] AT&T -> T-Mobile SMS?

Chris Adams cmadams at hiwaay.net
Tue Aug 4 16:26:17 EDT 2009

Is anyone else seeing problems sending SMS from AT&T to T-Mobile (or
other providers)?  When my monitoring system sends a message (via a GSM
modem with an AT&T SIM card) "Test page 3", AT&T accepts the message,
but I get an SMS back in just a few seconds from 1121611611 that says:

1xxxxxxxxxx Error Invalid Number. Please re-send using a valid 10 digit mobile number or valid short code. Test page 3

where xxxxxxxxxx is the 10 digit T-Mobile number I sent a message to.
It looks like something on the network is prepending a "1" and then
rejecting the message because of the "1".

This has been working fine for a while and just quit working today

Chris Adams <cmadams at hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

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