Excerpts from the book "Cisco IP Communications Express"
When an IP Phone hosted by Callmanager places an outbound call to the PSTN, the ringback tone heard by the caller is usually generated as an audio signal that's passed through end-to-end from the PSTN trunk (in-band tone). This means the audio path from the gateway to the IP Phone is opened and active before the call is connected.
As a side note when you place an outbound call if using MGCP with PRI for example after you get the PROCEEDING from the PSTN you will get a MDCX sent from the CCM or CA to GW so audio is passed from GW to IP phone as previous poster stated.
The MDCX will be send after CCM has opened audio channel in IP phone (STM using 200 OK from CRCX, ORC ack).
If talking about an FXS|FXO we will expect the hd and oc message in MGCP from the GW indicating that everything at MGCP and voice port level is ok. So audio is passed through
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
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...