[SIPForum-discussion] What are heart beat messages in VOIP via SIPcalls? What is the standard? Thanks

[XIAO Xiaohong]

sorry, should be rfc4028 <BLOCKED::http://rfc4028.txt> .

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From: XIAO Xiaohong 
Sent: 2008年5月22日 14:21
To: 'Yuantao Zhang'; discussion at sipforum.org
Subject: RE: [SIPForum-discussion] What are heart beat messages in VOIP via SIPcalls? What is the standard? Thanks


rfc4208.

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From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Yuantao Zhang
Sent: 2008年5月22日 13:59
To: discussion at sipforum.org
Subject: [SIPForum-discussion] What are heart beat messages in VOIP via SIPcalls? What is the standard? Thanks



What are heart beat messages in VOIP via SIP calls? What is the standard? Thanks

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