diff --git a/third-party/pjproject/patches/0012-Fixed-deadlock-between-SIP-transaction-and-dialog.patch b/third-party/pjproject/patches/0012-Fixed-deadlock-between-SIP-transaction-and-dialog.patch
new file mode 100644
index 0000000000..c4528a93a6
--- /dev/null
+++ b/third-party/pjproject/patches/0012-Fixed-deadlock-between-SIP-transaction-and-dialog.patch
@@ -0,0 +1,66 @@
+From 0072440c69311bf78f83d00c0ec9566cd9b1e578 Mon Sep 17 00:00:00 2001
+From: sauwming <ming@teluu.com>
+Date: Fri, 7 Apr 2023 09:09:45 +0800
+Subject: [PATCH] Different approach: release the lock when calling the
+ callback, without using timer thread
+
+---
+ pjsip/src/pjsip/sip_transaction.c | 25 +++++++++++++------------
+ 1 file changed, 13 insertions(+), 12 deletions(-)
+
+diff --git a/pjsip/src/pjsip/sip_transaction.c b/pjsip/src/pjsip/sip_transaction.c
+index d0ed64430..87edf0a04 100644
+--- a/pjsip/src/pjsip/sip_transaction.c
++++ b/pjsip/src/pjsip/sip_transaction.c
+@@ -143,6 +143,7 @@ enum
+ {
+     NO_NOTIFY = 1,
+     NO_SCHEDULE_HANDLER = 2,
++    RELEASE_LOCK = 4
+ };
+ 
+ /* Prototypes. */
+@@ -1330,16 +1331,18 @@ static void tsx_set_state( pjsip_transaction *tsx,
+          * 3. tsx_shutdown() hasn't been called.
+          * Refer to ticket #2001 (https://github.com/pjsip/pjproject/issues/2001).
+          */
+-        if (event_src_type == PJSIP_EVENT_TIMER &&
+-            (pj_timer_entry *)event_src == &tsx->timeout_timer)
++        if ((flag & RELEASE_LOCK) != 0 ||
++            (event_src_type == PJSIP_EVENT_TIMER &&
++             (pj_timer_entry *)event_src == &tsx->timeout_timer))
+         {
+             pj_grp_lock_release(tsx->grp_lock);
+         }
+ 
+         (*tsx->tsx_user->on_tsx_state)(tsx, &e);
+ 
+-        if (event_src_type == PJSIP_EVENT_TIMER &&
+-            (pj_timer_entry *)event_src == &tsx->timeout_timer)
++        if ((flag & RELEASE_LOCK) != 0 ||
++            (event_src_type == PJSIP_EVENT_TIMER &&
++             (pj_timer_entry *)event_src == &tsx->timeout_timer))
+         {
+             pj_grp_lock_acquire(tsx->grp_lock);
+         }
+@@ -2044,14 +2047,12 @@ static void send_msg_callback( pjsip_send_state *send_state,
+             if (tsx->state != PJSIP_TSX_STATE_TERMINATED &&
+                 tsx->state != PJSIP_TSX_STATE_DESTROYED)
+             {
+-                pj_time_val delay = {0, 0};
+-
+-                /* Post the event for later processing, to avoid deadlock. */
+-                lock_timer(tsx);
+-                tsx_cancel_timer(tsx, &tsx->timeout_timer);
+-                tsx_schedule_timer(tsx, &tsx->timeout_timer, &delay,
+-                                   TRANSPORT_ERR_TIMER);
+-                unlock_timer(tsx);
++                /* Set tsx state to TERMINATED, but release the lock
++                 * when invoking the callback, to avoid deadlock.
++                 */
++                tsx_set_state( tsx, PJSIP_TSX_STATE_TERMINATED,
++                               PJSIP_EVENT_TRANSPORT_ERROR,
++                               send_state->tdata, RELEASE_LOCK);
+             } 
+             /* Don't forget to destroy if we have pending destroy flag
+              * (https://github.com/pjsip/pjproject/issues/906)