One SIP account on multiples phones

Hi, could you please help me? I have Asterisk version 16.28, and it’s not possible to register one SIP account on multiple phones? Is it possible to perform such a registration on Asterisk? If so, from which version? Thank you.

With chan_sip, no. With chan_pjsip, yes if configured to allow it.

Also note that Asterisk 16 is past end of life, and chan_sip was already deprecated in that version, and is no longer present at all, in the two latest versions.

Specifically, see max_contacts in the aor section.