From time to time I’m asked by my customers if it is possible to include a cellular phone as a queue member. Yes, it is easy to do. You may include any phone number, not only cell or SIP, which is registered on your Asterisk server. Asterisk must be compiled with the local channel support. Everything is done with its help.
queues.conf:
[queue_cell_and_sip] strategy = ringall servicelevel = 10 joinempty = yes music = default member => SIP/1301 member => Local/79221234567@your-context
extensions.ael:
... 1810 => { Answer; Queue(queue_cell_and_sip); Hangup; } ...