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# This mainly relies on voicemail being able to activate based on caller phone number, so if it is a SMS relay service such as BT Text or AQL calling, divert to voicemail: # Then optionally play the initial FSK communication of ETSI ES 201 912, in the SM-TE role, to have a chance to get the SMS digitally # If the caller (SM-SC) replies with FSK quickly in accordance with ETSI ES 201 912 then accept the SMS digitally and deliver as an [[SMS#Inbound_SMS\|Inbound SMS]], otherwise: # send dialpad digits to have SM-SC play SMS as text-to-speech

Talk:SMS (view source)