diff --git a/conf/vanilla/sip_profiles/external-ipv6.xml b/conf/vanilla/sip_profiles/external-ipv6.xml
index be70ff3b1e..ea66679c37 100644
--- a/conf/vanilla/sip_profiles/external-ipv6.xml
+++ b/conf/vanilla/sip_profiles/external-ipv6.xml
@@ -63,8 +63,9 @@
     -->
     <param name="rtp-ip" value="$${local_ip_v6}"/>
     <param name="sip-ip" value="$${local_ip_v6}"/>
-    <param name="ext-rtp-ip" value="auto-nat"/>
-    <param name="ext-sip-ip" value="auto-nat"/>
+    <!-- Shouldn't set these on IPv6 -->
+    <!--<param name="ext-rtp-ip" value="auto-nat"/>-->
+    <!--<param name="ext-sip-ip" value="auto-nat"/>-->
     <param name="rtp-timeout-sec" value="300"/>
     <param name="rtp-hold-timeout-sec" value="1800"/>
     <!--<param name="enable-3pcc" value="true"/>-->
diff --git a/conf/vanilla/sip_profiles/internal-ipv6.xml b/conf/vanilla/sip_profiles/internal-ipv6.xml
index 98efa2ffbb..21bb1f1e77 100644
--- a/conf/vanilla/sip_profiles/internal-ipv6.xml
+++ b/conf/vanilla/sip_profiles/internal-ipv6.xml
@@ -96,6 +96,7 @@
     <param name="auth-calls" value="$${internal_auth_calls}"/>
     <!-- on authed calls, authenticate *all* the packets not just invite -->
     <param name="auth-all-packets" value="false"/>
+    <!-- Shouldn't set these on IPv6 -->
     <!-- <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> -->
     <!-- <param name="ext-sip-ip" value="$${external_sip_ip}"/> -->
     <!-- rtp inactivity timeout -->
diff --git a/src/mod/endpoints/mod_sofia/sofia_glue.c b/src/mod/endpoints/mod_sofia/sofia_glue.c
index 0a46691a0e..ec25e3645d 100644
--- a/src/mod/endpoints/mod_sofia/sofia_glue.c
+++ b/src/mod/endpoints/mod_sofia/sofia_glue.c
@@ -455,17 +455,18 @@ char *sofia_glue_create_external_via(switch_core_session_t *session, sofia_profi
 
 char *sofia_glue_create_via(switch_core_session_t *session, const char *ip, switch_port_t port, sofia_transport_t transport)
 {
+	char *ipv6 = strchr(ip, ':');
 	if (port && port != 5060) {
 		if (session) {
-			return switch_core_session_sprintf(session, "SIP/2.0/%s %s:%d;rport", sofia_glue_transport2str(transport), ip, port);
+			return switch_core_session_sprintf(session, "SIP/2.0/%s %s%s%s:%d;rport", sofia_glue_transport2str(transport), ipv6 ? "[" : "", ip, ipv6 ? "]" : "", port);
 		} else {
-			return switch_mprintf("SIP/2.0/%s %s:%d;rport", sofia_glue_transport2str(transport), ip, port);
+			return switch_mprintf("SIP/2.0/%s %s%s%s:%d;rport", sofia_glue_transport2str(transport), ipv6 ? "[" : "", ip, ipv6 ? "]" : "", port);
 		}
 	} else {
 		if (session) {
-			return switch_core_session_sprintf(session, "SIP/2.0/%s %s;rport", sofia_glue_transport2str(transport), ip);
+			return switch_core_session_sprintf(session, "SIP/2.0/%s %s%s%s;rport", sofia_glue_transport2str(transport), ipv6 ? "[" : "", ip, ipv6 ? "]" : "");
 		} else {
-			return switch_mprintf("SIP/2.0/%s %s;rport", sofia_glue_transport2str(transport), ip);
+			return switch_mprintf("SIP/2.0/%s %s%s%s;rport", sofia_glue_transport2str(transport), ipv6 ? "[" : "", ip, ipv6 ? "]" : "");
 		}
 	}
 }