[Standards-JIG] XEP-0155: do we need it for SIP?

Ian Paterson ian.paterson at clientside.co.uk
Thu Nov 9 23:12:27 UTC 2006

Peter Saint-Andre wrote:
> OK, now that XEP-0155 (Chat Session Negotiation) is in Last Call, I've
> come to wonder: do we really need it?
> One of the main use cases people have in mind for XEP-0155 is enabling
> text chat between XMPP users and SIP users.

It sounds like we may not need it for SIP. However, although the most 
important use cases were for SIP when the initial version of the XEP was 
authored, they aren't anymore.

XEP-0155 (or some other chat session protocol) is necessary for OTR 
negotiation (see XEP-0136) and for end-to-end encryption negotiation 
(see XEP-0116). There are other use cases defined in the XEP and  I 
expect that once it has been widely implemented XEP-0155 will be used 
for an increasing number of applications (negotiated sessions are useful).

In fact in the latest CVS version (0.11) the "Mapping to SIP" section 
has moved into a short sub-section of the Implementation Notes. We can 
certainly remove it completely if the Jingle folks think that is a good 

Hmm, now we're in last call, maybe that CVS version of XEP-0155 needs to 
be published (my bad):

- Ian

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