diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 19cc9fd6a5..d478892da2 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -9566,11 +9566,13 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
 	if (user && ast_apply_ha(user->ha, sin)) {
 		ast_copy_flags(&p->flags[0], &user->flags[0], SIP_FLAGS_TO_COPY);
 		ast_copy_flags(&p->flags[1], &user->flags[1], SIP_PAGE2_FLAGS_TO_COPY);
-		/* copy channel vars */
-		for (v = user->chanvars ; v ; v = v->next) {
-			if ((tmpvar = ast_variable_new(v->name, v->value))) {
-				tmpvar->next = p->chanvars; 
-				p->chanvars = tmpvar;
+		if (sipmethod == SIP_INVITE) {
+			/* copy channel vars */
+			for (v = user->chanvars ; v ; v = v->next) {
+				if ((tmpvar = ast_variable_new(v->name, v->value))) {
+					tmpvar->next = p->chanvars; 
+					p->chanvars = tmpvar;
+				}
 			}
 		}
 		p->prefs = user->prefs;
@@ -9724,11 +9726,13 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
 				ast_string_field_set(p, peername, peer->name);
 				ast_string_field_set(p, authname, peer->name);
 
-				/* copy channel vars */
-				for (v = peer->chanvars ; v ; v = v->next) {
-					if ((tmpvar = ast_variable_new(v->name, v->value))) {
-						tmpvar->next = p->chanvars; 
-						p->chanvars = tmpvar;
+				if (sipmethod == SIP_INVITE) {
+					/* copy channel vars */
+					for (v = peer->chanvars ; v ; v = v->next) {
+						if ((tmpvar = ast_variable_new(v->name, v->value))) {
+							tmpvar->next = p->chanvars; 
+							p->chanvars = tmpvar;
+						}
 					}
 				}
 				if (authpeer) {