Originally posted by hgllgh
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It is not a feature translated to SS7 signalling so if calling from a landline they would only receive the SMS if there was no PABX in the way, i.e. a single POTS line with an SMS to speech service.*
If they are calling from a mobile, SMS in UMTS is sent using the SRB, so they would get a text message to their phone.
*Well you could implement it in a PABX for DD, but never seen it in the wild.
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