diff --git a/src/mod/endpoints/mod_sofia/mod_sofia.c b/src/mod/endpoints/mod_sofia/mod_sofia.c
index 086d6dd088..d85142f480 100644
--- a/src/mod/endpoints/mod_sofia/mod_sofia.c
+++ b/src/mod/endpoints/mod_sofia/mod_sofia.c
@@ -5039,6 +5039,12 @@ static switch_call_cause_t sofia_outgoing_channel(switch_core_session_t *session
 
 	sofia_glue_attach_private(nsession, profile, tech_pvt, dest);
 
+	// specify rtp ip by variable
+	if (switch_true(switch_event_get_header(var_event, "rtp_ip_v4"))) {
+		tech_pvt->mparams.rtpip4 = switch_core_strdup(profile->pool, switch_event_get_header(var_event, "rtp_ip_v4"));
+		tech_pvt->mparams.rtpip = tech_pvt->mparams.rtpip4;
+	}
+
 	if (tech_pvt->local_url) {
 		switch_channel_set_variable(nchannel, "sip_local_url", tech_pvt->local_url);
 		if (profile->pres_type) {