OK, tried it from the spa941. I thought it wasn't even getting to the Sail box, but I was wrong.
-- Executing [*60*@internal:1] Background(SIP/5001-09537b68", "silence/1") in new stack
-- <SIP/5001-09537b68> Playing 'silence/1' (language 'en')
-- Executing [*60*@internal:2] AGI("SIP/5001-09537b68", "selintra|*60*") in new stack
-- Launched AGI Script /var/lib/asterisk/agi-bin/selintra
-- AGI Script selintra completed, returning 0
== Auto fallthrough, channel 'SIP/5001-09537b68' status in 'UNKNOWN'
-- Executing [h@internal:1] Hanhup("SIP/5001-09537b68", "") in new stack
== Spawn extension (internal, h, 1) exited non-zero on 'SIP/5001-09537b69'
Needless to say as quick as I dial *60*xxxx it hangs up..