--- /dev/null
+From 6324760c2fb0ffeb2e29c6c0a96a33906caa8d5f Mon Sep 17 00:00:00 2001
+From: Sean Bright <sean.bright@gmail.com>
+Date: Thu, 16 Jan 2020 10:46:11 -0500
+Subject: [PATCH] sip_parser.c: Allow brackets in via parameters
+
+From RFC 5118 section 4.5:
+
+ While it would be beneficial if the same non-terminal
+ ("IPv6reference") was used for both the "sent-by" and "via-received"
+ production rules, there has not been a consensus in the working group
+ to that effect. Thus, the best that can be suggested is that
+ implementations must follow the Robustness Principle [RFC1122] and be
+ liberal in accepting a "received" parameter with or without the
+ delimiting "[" and "]" tokens. When sending a request,
+ implementations must not put the delimiting "[" and "]" tokens.
+---
+ pjsip/src/pjsip/sip_parser.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pjsip/src/pjsip/sip_parser.c b/pjsip/src/pjsip/sip_parser.c
+index e01e672fb..4f9c7fca4 100644
+--- a/pjsip/src/pjsip/sip_parser.c
++++ b/pjsip/src/pjsip/sip_parser.c
+@@ -384,11 +384,11 @@ static pj_status_t init_parser()
+
+ status = pj_cis_dup(&pconst.pjsip_VIA_PARAM_SPEC, &pconst.pjsip_TOKEN_SPEC);
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+- pj_cis_add_str(&pconst.pjsip_VIA_PARAM_SPEC, ":");
++ pj_cis_add_str(&pconst.pjsip_VIA_PARAM_SPEC, "[:]");
+
+ status = pj_cis_dup(&pconst.pjsip_VIA_PARAM_SPEC_ESC, &pconst.pjsip_TOKEN_SPEC_ESC);
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+- pj_cis_add_str(&pconst.pjsip_VIA_PARAM_SPEC_ESC, ":");
++ pj_cis_add_str(&pconst.pjsip_VIA_PARAM_SPEC_ESC, "[:]");
+
+ status = pj_cis_dup(&pconst.pjsip_HOST_SPEC, &pconst.pjsip_ALNUM_SPEC);
+ PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
+--
+2.20.1
+