Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 318547)
+++ channels/chan_sip.c	(working copy)
@@ -8634,6 +8643,11 @@
                ast_set_read_format(p->owner, p->owner->readformat);
                ast_set_write_format(p->owner, p->owner->writeformat);
        }
+       else
+       {
+               /* IVeS - restrict nativeformat to joincaps = formats natively supported by the chan */
+               p->owner->nativeformats = p->jointcapability;
+       }

        if (ast_test_flag(&p->flags[1], SIP_PAGE2_CALL_ONHOLD) && (!ast_sockaddr_isnull(sa) || !ast_sockaddr_isnull(vsa) || !ast_sockaddr_isnull(tsa) || !ast_sockaddr_isnull(isa)) && (!sendonly || sendonly == -1)) {
                ast_queue_control(p->owner, AST_CONTROL_UNHOLD);