diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index de23063..74ea9cd 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -25828,11 +25828,32 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, str
 				goto request_invite_cleanup;
 			}
 
+			/* We cannot call sip_new with any locks held.
+			 * Unlock the referred channel if locked. */
+			if (refer_locked) {
+				sip_pvt_unlock(p->refer->refer_call);
+				if (p->refer->refer_call->owner) {
+					ast_channel_unlock(p->refer->refer_call->owner);
+				}
+			}
+
 			/* First invitation - create the channel.  Allocation
 			 * failures are handled below. */
-
 			c = sip_new(p, AST_STATE_DOWN, S_OR(p->peername, NULL), NULL, p->logger_callid);
 
+			/* Reacquire the lock on the referred call. */
+			if (refer_locked) {
+				/* Reuse pattern found in get_sip_pvt_byid_locked. */
+				sip_pvt_lock(p->refer->refer_call);
+				while (p->refer->refer_call->owner && ast_channel_trylock(p->refer->refer_call->owner)) {
+					sip_pvt_unlock(p->refer->refer_call);
+					usleep(1);
+					sip_pvt_lock(p->refer->refer_call);
+				}
+			}
+
+			/* XXX: todo: check that the channel is unmodified and available? */
+
 			if (cc_recall_core_id != -1) {
 				ast_setup_cc_recall_datastore(c, cc_recall_core_id);
 				ast_cc_agent_set_interfaces_chanvar(c);