diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index 6b9f1380e5..496c455565 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/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");
-		switch_ivr_transfer_variable(session, nsession, SOFIA_SIP_HEADER_PREFIX_T);
+		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");