In the context between Call Manager and a voice gateway using MGCP.
When terminating an ISDN PRI connection on a gateway, the Q.931 messages from the PSTN are backhauled via TCP to Call Manager for processing.
My understanding of why this is done is due to the master/slave relationship between endpoints in MGCP. All intelligence resides in the Call Agent (i.e Call Manager), not the gateways. As opposed to H.323, which assumes each endpoint possess a full or near full "knowledge" of the H.323 protocol suite. Since Q.931 manages call set up/ call tear down, it is logical to assume these functions should be processed on the device with the intelligence (i.e Call Agent).
Rob is correct, and PRI Backhauling is enabled by default on MGCP-controlled PRI. It establishes a tcp link to port 2428 on the Callmanager and communicates all D-channel Q931 signaling information with CallManager for call processing. This also means that the gateway will not bring up the D-channel unless it can communicate with Cisco CallManager to backhaul the Q.931 messages contained in the D-channel. In a MGCP gateway, give the command "show ccm" to find whether the PRI backhaul connection is active.
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...