Cisco TelePresence Video Communication Server Administrator's Manual page 300

Reference material
H323 Gateway CallerId: <IncludePrefix/ExcludePrefix>
Specifies whether the prefix of the ISDN gateway is inserted into the caller's E.164 number presented on the
destination endpoint. Including the prefix allows the recipient to directly return the call.
IncludePrefix: inserts the ISDN gateway's prefix into the source E.164 number.
ExcludePrefix: only displays the source E.164 number.
Default: ExcludePrefix
Example: xConfiguration H323 Gateway CallerId: ExcludePrefix
H323 Mode: <On/Off>
Determines whether or not the VCS will provide H.323 gatekeeper functionality.
Default: On
Example: xConfiguration H323 Mode: On
Interworking Encryption Mode: <Auto/Off>
Determines whether or not the VCS will allow encrypted calls between SIP and H.323 endpoints.
Off: interworked calls will never be encrypted.
Auto: interworked calls will be encrypted if the endpoints request it.
Default: Auto
Example: xConfiguration Interworking Encryption Mode: Auto
Interworking Encryption Replay Protection Mode: <On/Off>
Controls whether the VCS will perform replay protection for incoming SRTP packets when interworking a call.
On: replayed SRTP packets will be dropped by the VCS.
Off: the VCS will not check for replayed SRTP packets.
Default: Off
Example: xConfiguration Interworking Encryption Replay Protection Mode: Off
Interworking Mode: <On/Off/RegisteredOnly>
Determines whether or not the VCS will act as a gateway between SIP and H.323 calls.
Off: the VCS will not act as a SIP-H.323 gateway.
On: the VCS will act as SIP-H.323 gateway regardless of whether the endpoints are locally registered.
RegisteredOnly: the VCS will act as a SIP-H.323 gateway but only if at least one of the endpoints is locally
registered.
Default: RegisteredOnly
Example: xConfiguration Interworking Mode: RegisteredOnly
Cisco VCS Administrator Guide (X6.1) Page 300 of 401