philologist's techblog

What to do if somebody set up call redirect from his number to yours one, but you do not want to accept such calls?

According to RFC5806 – Diversion Indication in SIP,

The Diversion header SHOULD be added when a SIP proxy server, SIP
redirect server, or SIP user agent changes the ultimate endpoint that
will receive the call.

So, you have to reject INVITEs with Diversion header. This is how it looks like on the AcmePacket. One more header-rule (if you already have any) in sip-manipulation rule:

header-rule
	name                           reject_diversion
	header-name                    Diversion
	action                         manipulate
	comparison-type                case-sensitive
	msg-type                       request
	methods                        INVITE
	match-value                    
	new-value                      
	element-rule
		name                           rej_diversion
		parameter-name                 
		type                           header-value
		action                         reject
		match-val-type                 any
		comparison-type                pattern-rule
		match-value                    ^.*$
		new-value                      

You may also add something like “603:Decline” to “new-value” parameter.

Or even like this, without any responce codes and element-rules:

header-rule
                name                                    rejectDiversion
                header-name                             Diversion
                action                                  reject
                comparison-type                         boolean
                msg-type                                request
                methods                                 INVITE
                match-value                             
                new-value