So to answer my own question, yes it does seem to be broken, the
following patch fixes it but I'm not sure if this is the right thing to do:


diff --git a/src/mod/endpoints/mod_sofia/sofia.c
b/src/mod/endpoints/mod_sofia/sofia.c
index b76a804..29f233d 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -6532,15 +6532,20 @@ static void
sofia_handle_sip_r_invite(switch_core_session_t *session, int status
                 switch_channel_clear_flag(channel, CF_REQ_MEDIA);

                 if (status < 200) {
-                       if (switch_core_session_get_partner(session,
&other_session) == SWITCH_STATUS_SUCCESS) {
- if(switch_core_session_compare(session, other_session)) {
-                                       private_object_t *other_tech_pvt
= switch_core_session_get_private(other_session);
-                                       if
(sofia_test_flag(other_tech_pvt, TFLAG_3PCC)) {
- sofia_set_flag_locked(tech_pvt, TFLAG_SKIP_EARLY);
-                                       }
-                               }
- switch_core_session_rwunlock(other_session);
-                       }
+//
+// **AlanE**
+// The following code sets TFLAG_SKIP_EARLY for the b-leg of a call
with a 3PCC on the a-leg
+// this then later on causes the call to fail with no write codec error
+// Just commenting the code out seems to fix the issue
+//                     if (switch_core_session_get_partner(session,
&other_session) == SWITCH_STATUS_SUCCESS) {
+// if(switch_core_session_compare(session, other_session)) {
+//                                     private_object_t *other_tech_pvt
= switch_core_session_get_private(other_session);
+//                                     if
(sofia_test_flag(other_tech_pvt, TFLAG_3PCC)) {
+// sofia_set_flag_locked(tech_pvt, TFLAG_SKIP_EARLY);
+//                                     }
+//                             }
+// switch_core_session_rwunlock(other_session);
+//                     }

                         if (sofia_test_flag(tech_pvt, TFLAG_SKIP_EARLY)) {
                                 return;


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