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Why CONNECT ACK does not EndpointRef ?

From: "ytq@hwbji.co.cn" <ytq@hwbji.co.cn>
Date: Fri, 25 Jul 1997 20:00:41 +0800

  I have a question:

  Under UNI4.0, Assume that the root sends a SETUP (1) to leaf 1, leaf 1
responded with the ALERTING, Now root sends an ADD PARTY(2) to leaf 2,
but leaf 2 responds with the CONNECT even before leaf 1 can respond with
CONNECT .In this case the root will first receive a CONNECT (2).
  that is to say,when network side receive a CONNECT(2), it will
response with CONNECT ACK ( having no EndPointReference),so user
(i.e,PBX switch) should remember (2) which send CONNECT.
  if CONNECT ACK has EndpointReference,that will be okay?
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Yuan Tingqiu  ytq@hwbji.co.cn Tel : +86 010 62561600 Fax: 68744460
Shenzhen Huawei Tech. Co.,Ltd.P.O.Box:2708-48 Beijing China(100080)