RE: [Sip] PING/PONG
"Steve Langstaff" <steve.langstaff@citel.com> Wed, 10 November 2004 14:24 UTC
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Subject: RE: [Sip] PING/PONG
Date: Wed, 10 Nov 2004 13:55:17 -0000
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Thread-Topic: [Sip] PING/PONG
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From: Steve Langstaff <steve.langstaff@citel.com>
To: Christian Stredicke <Christian.Stredicke@snom.de>, Chris Boulton <cboulton@ubiquity.net>, "Christer Holmberg (JO/LMF)" <christer.holmberg@ericsson.com>, fluffy@cisco.com
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Fair enough. I must have missed the description of PING/PONG messages were for. I apologise. -- Steve Langstaff. -----Original Message----- From: Christian Stredicke [mailto:Christian.Stredicke@snom.de] Sent: 10 November 2004 10:36 To: Steve Langstaff; Chris Boulton; Christer Holmberg (JO/LMF); fluffy@cisco.com Cc: sip@ietf.org Subject: RE: [Sip] PING/PONG True. For that purpose, use e.g. INFO messages with no body. These messages keep the dialog "alive". However, the goal of the PING/PONG keep-alive messages is to keep the NAT-binding alive. So that you are able to receive the first INVITE! CS _____ From: sip-bounces@ietf.org [mailto:sip-bounces@ietf.org] On Behalf Of Steve Langstaff Sent: Wednesday, November 10, 2004 5:16 AM To: Christian Stredicke; Chris Boulton; Christer Holmberg (JO/LMF); fluffy@cisco.com Cc: sip@ietf.org Subject: RE: [Sip] PING/PONG (CS) OPTIONS has the problem that it is relatively expensive (size and CPU) and might result in responses that exceed the UDP fragmentation limit (there are many DSL routers that treat UDP fragmentation as security problem including the one that I have at home). Therefore I think it would not hurt to have a specific message that is designed only for the keep-alive job. ...but if you want your keep alive message to be routed over the same path and transports as your original INVITE (and hence keep them alive), don't you need most of the "expensive" content of (say) the OPTIONS message - e.g. the vias. -- Steve Langstaff.
_______________________________________________ Sip mailing list https://www1.ietf.org/mailman/listinfo/sip This list is for NEW development of the core SIP Protocol Use sip-implementors@cs.columbia.edu for questions on current sip Use sipping@ietf.org for new developments on the application of sip
- [Sip] PING/PONG Christian Stredicke
- RE: [Sip] PING/PONG Christer Holmberg (JO/LMF)
- RE: [Sip] PING/PONG Steve Langstaff
- Re: [Sip] PING/PONG Bob Penfield
- RE: [Sip] PING/PONG Christer Holmberg (JO/LMF)
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- RE: [Sip] PING/PONG Steve Langstaff
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