*** chan_sip.orig	2011-08-17 12:58:10.000000000 +0200
--- chan_sip.c	2011-08-17 13:10:55.165354747 +0200
*************** int __sip_ack(struct sip_pvt *p, int seq
*** 3970,3976 ****
  		if (cur->is_resp || cur->method == sipmethod) {
  			res = TRUE;
  			msg = "Found";
! 			if (!resp && (seqno == p->pendinginvite)) {
  				ast_debug(1, "Acked pending invite %d\n", p->pendinginvite);
  				p->pendinginvite = 0;
  			}
--- 3970,3976 ----
  		if (cur->is_resp || cur->method == sipmethod) {
  			res = TRUE;
  			msg = "Found";
! 			if (!resp && (seqno == p->pendinginvite) && sipmethod != SIP_UPDATE) {
  				ast_debug(1, "Acked pending invite %d\n", p->pendinginvite);
  				p->pendinginvite = 0;
  			}