This is the first in my series of posts on Jingle. More soon. According to version 0.25 of XEP-0166, use of the content-replace action is forbidden during the PENDING state. However, XEP-0176 (ICE-UDP) uses the content-replace action during the PENDING state:
http://www.xmpp.org/extensions/xep-0176.html#protocol-acceptance In XEP-0176, this usage maps to nomination of the candidates to be used in ICE, see section 2.6 of draft-ietf-mmusic-ice-19. However, in ICE this nomination is done over STUN, not via SIP/SDP. Therefore I think the content-replace action is unnecessary in XEP-0176 (since nomination in the Jingle ICE-UDP transport will also occur over STUN and does not need to happen in the signalling channel). Unless there are objections, I will update XEP-0176 accordingly (a usage inherited by some of the examples in XEP-0167 and XEP-0180, which will be harmonized with the modified XEP-0176). Peter -- Peter Saint-Andre https://stpeter.im/
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