It took an OpenVox engineer to sort out this obscure problem in the end, but it was pretty much as I suspected: the Quectel M20 GSM module serving span 1 was stuck in an unusual state, in which it would only operate in the 900 MHz band. Fine for O2, Vodafone and Tesco; but no good for T-Mobile or Orange!
What fixed it was this: cli> gsm send at 1 AT+QBAND=\"GSM850_EGSM_DCS_PCS_MODE\" (note the backslashes before the speech marks). I had actually *almost* managed to work this out for myself, except for missing the backslashes; without which, it didn't work. Anyway. If you have a G400P card (or, presumably, a G400E -- which uses the same GSM modules, just has a different host interface) and some SIM slots seem to be locked to a particular phone company (or group of phone companies) then this might well be what is up with yours. Check with cli> gsm send at 1 AT+QBAND@ (Replace 1 with the number of the misbehaving span. The CLI will replace the @ sign with a question mark.) If the response you get is anything other than +QBAND: "GSM850_EGSM_DCS_PCS_MODE" then this fix is what you need to do. (If you get no response at all, then try cli> gsm show span 1 which will include the result from the last AT command -- assuming it hasn't been overwritten by a signal strength report in the meantime, in which case repeat the AT+QBAND@ command.) -- AJS Answers come *after* questions. -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users