Cisco Cisco Expressway Maintenance Manual
Protocols
This section provides information about how to configure the Expressway to support the SIP and H.323 protocols.
Configuring H.323
The H.323 page (Configuration > Protocols > H.323) is used to configure the H.323 settings on the Expressway,
including:
including:
■
whether H.323 is enabled or not
■
whether to insert the prefix of the ISDN gateway into the caller's E.164 number presented on the destination
endpoint
endpoint
The configurable options are:
Field
Description
Usage tips
H.323 mode
Enables or disables H.323 on the Expressway. H.323
support is On by default.
support is On by default.
Call signaling
TCP port
TCP port
The listening port for H.323 call signaling. Default is
1720.
1720.
Call signaling
port range
start and end
port range
start and end
Specifies the lower port in the range used by H.323
calls after they are established. Default is 15000.
calls after they are established. Default is 15000.
The call signaling port range must be
great enough to support all the required
concurrent calls.
great enough to support all the required
concurrent calls.
Call time to live
The interval (in seconds) at which the Expressway polls
the endpoints in a call to verify that they are still in the
call. Default is 120.
the endpoints in a call to verify that they are still in the
call. Default is 120.
If the endpoint does not respond, the
call will be disconnected.
call will be disconnected.
Auto discover
Determines whether it will respond to Gatekeeper
Discovery Requests sent out by endpoints. The default
is On.
Discovery Requests sent out by endpoints. The default
is On.
Configuring SIP
The SIP page (Configuration > Protocols > SIP) is used to configure the SIP settings on the Expressway, including:
■
SIP functionality and SIP-specific transport modes and ports
■
certificate revocation checking modes for TLS connections
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