Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 225759)
+++ channels/chan_sip.c	(working copy)
@@ -16816,6 +16816,7 @@
 			sip_alreadygone(p);
 		}
 		break;
+	case 415: /* Unsupported media type */
 	case 488: /* Not acceptable here */
 		xmitres = transmit_request(p, SIP_ACK, seqno, XMIT_UNRELIABLE, FALSE);
 		if (p->udptl && p->t38.state == T38_LOCAL_REINVITE) {
@@ -17395,6 +17396,7 @@
 			if (sipmethod == SIP_INVITE)
 				handle_response_invite(p, resp, rest, req, seqno);
 			break;
+		case 415: /* Unsupported media type - codec error */
 		case 488: /* Not acceptable here - codec error */
 			if (sipmethod == SIP_INVITE)
 				handle_response_invite(p, resp, rest, req, seqno);