res_pjsip_caller_id chan_sip: Comply to RFC 3323 values for privacy

Currently privacy requests are only granted if the Privacy header
value is exactly "id" (defined in RFC 3325). It ignores any other
possible value (or a combination there of). This patch reverses the
logic from testing for "id" to grant privacy, to testing for "none" and
granting privacy for any other value. "none" must not be used in
combination with any other value (RFC 3323 section 4.2).

ASTERISK-27284 #close

Change-Id: If438a21f31a962da32d7a33ff33bdeb1e776fe56

channels/chan_sip.c

@@ -18026,7 +18026,7 @@ static int get_pai(struct sip_pvt *p, struct sip_request *req)
 	}
 
 	ast_copy_string(privacy, sip_get_header(req, "Privacy"), sizeof(privacy));
-	if (!ast_strlen_zero(privacy) && !strncmp(privacy, "id", 2)) {
+	if (!ast_strlen_zero(privacy) && strcasecmp(privacy, "none")) {
 		callingpres = AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;
 	}
 	if (!cid_name) {

res/res_pjsip_caller_id.c

@@ -149,12 +149,12 @@ static int set_id_from_pai(pjsip_rx_data *rdata, struct ast_party_id *id)
 	}
 
 	privacy = pjsip_msg_find_hdr_by_name(rdata->msg_info.msg, &privacy_str, NULL);
-	if (privacy && !pj_stricmp2(&privacy->hvalue, "id")) {
-		id->number.presentation = AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;
-		id->name.presentation = AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;
-	} else {
+	if (!privacy || !pj_stricmp2(&privacy->hvalue, "none")) {
 		id->number.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
 		id->name.presentation = AST_PRES_ALLOWED_USER_NUMBER_NOT_SCREENED;
+	} else {
+		id->number.presentation = AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;
+		id->name.presentation = AST_PRES_PROHIB_USER_NUMBER_NOT_SCREENED;
 	}
 
 	return 0;