set sip_copy_custom_headers=false to avoid custom sip headers to be copied on the b-leg

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15789 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -3159,7 +3159,9 @@ static switch_call_cause_t sofia_outgoing_channel(switch_core_session_t *session
 		
 		switch_ivr_transfer_variable(session, nsession, SOFIA_REPLACES_HEADER);
 		switch_ivr_transfer_variable(session, nsession, "sip_auto_answer");
+		if (!(vval = switch_channel_get_variable(o_channel, "sip_copy_custom_headers")) || switch_true(vval)) {
 			switch_ivr_transfer_variable(session, nsession, SOFIA_SIP_HEADER_PREFIX_T);			
+		}
 		switch_ivr_transfer_variable(session, nsession, "sip_video_fmtp");
 		switch_ivr_transfer_variable(session, nsession, "sip-force-contact");
 		switch_ivr_transfer_variable(session, nsession, "sip_sticky_contact");