Cisco Cisco Expressway Maintenance Manual
Configuring call routing and signaling
The
Call routing
page (
Configuration > Call routing
) is used to configure the Expressway's call routing
and signaling functionality.
Call signaling optimization
, the Expressway always
handles both the media and the signaling. For non-traversal calls, the Expressway does not handle the
media, and may or may not need to handle the signaling.
media, and may or may not need to handle the signaling.
The Call signaling optimization setting specifies whether the Expressway removes itself, where it can,
from the call signaling path after the call has been set up. The options for this setting are:
from the call signaling path after the call has been set up. The options for this setting are:
n
Off: the Expressway always handles the call signaling.
n
On: the Expressway handles the call signaling when the call is one of:
l
a traversal call
l
an H.323 call that has been modified by Call Policy such that the call resolves to more than one alias
l
a SIP call where the incoming transport protocol (UDP, TCP, TLS) is different from the outgoing protocol
In all other cases the Expressway removes itself from the call signaling path after the call has been set up.
The Expressway does not consume a call license for any such calls, and the call signaling path is
simplified.
The Expressway does not consume a call license for any such calls, and the call signaling path is
simplified.
Call loop detection mode
Your dial plan or that of networks to which you are neighbored may be configured in such a way that there are
potential signaling loops. An example of this is a structured dial plan, where all systems are neighbored
together in a mesh. In such a configuration, if the
potential signaling loops. An example of this is a structured dial plan, where all systems are neighbored
together in a mesh. In such a configuration, if the
sent repeatedly around the network until the hop count reaches 0, consuming resources unnecessarily.
The Expressway can be configured to detect search loops within your network and terminate such searches
through the Call loop detection mode setting, thus saving network resources. The options for this setting
are:
through the Call loop detection mode setting, thus saving network resources. The options for this setting
are:
n
On: the Expressway will fail any branch of a search that contains a loop, recording it as a level 2 "loop
detected" event. Two searches are considered to be a loop if they meet all of the following criteria:
detected" event. Two searches are considered to be a loop if they meet all of the following criteria:
l
have same call tag
l
are for the same destination alias
l
use the same protocol
l
originate from the same zone
n
Off: the Expressway will not detect and fail search loops. You are recommended to use this setting only in
advanced deployments.
advanced deployments.
Cisco Expressway Administrator Guide (X8.5)
Page 176 of 394
Dial plan and call processing
Configuring call routing and signaling