Yes, define a peer in sip.conf:
[openser] host=XX.XX.XX.XX insecure=invite
In this way Asterisk allow calls from OpenSer without forcing them to authenticate. Authenticacion had already place in OpenSer.So I guess this would function for calls coming from the PSTN gateway, what about for callsoriginating from SIP devices connected to Asterisk? Can I do some similar config on OpenSERso that calls authenticated on Asterisk dont require authentication for an INVITE on OpenSER?