I'm a bit confused. If used in true ip-to-ip call, invite should come from a third party and relayed by the router. Then, I have't ever seen invite w/o SDP, on the other hand is not that I have seen them all :)
Hm, as far as I can see, the call comes via H.323 and is relayed by SIP, so it's up to router whether to send SDP in INVITE or one of the subsequent messages.
Regarding INVITEs w/o SDP, yes, it can be. The spec says the offer MUST be in the INVITE or the first reliable non-failure message. It does NOT say that it can ONLY be in the INVITE or the first reliable non-failure message.
And such thing amy have some special appliances, e.g. draft-ietf-sipping-3pcc refers to INVITE messages sent without SDP body so as to manage third party call control.
I don't have IPIPGW to experiment now, but Cisco claims that since 12.3(11)T IOS supports interworking between H.323 Fast-Start and SIP early-media signaling. I would try the following to enable it: create voice class h323 like:
voice class h323 1
call start fast
and enter voice-class h323 1 command on the dial-peer.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
This document describe how DST changes and how time changes are
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