Cisco TelePresence Administrator's Manual page 443

Reference material
Zones Zone [1..1000] DNS SIP Duo Video Filter Mode: <On/Off>
Determines whether INVITE requests sent to this zone filter out Duo Video. This option may be required to
enable interoperability with SIP devices that do not support Duo Video.
On: the second video line in any outgoing INVITE request is removed.
Off: INVITE requests are not modified.
Default: Off
Example: xConfiguration Zones Zone 1 DNS SIP Duo Video Filter Mode: Off
Zones Zone [1..1000] DNS SIP Media Encryption Mode: <Off/On/BestEffort/Auto>
On: All media must be encrypted.
Off: All media must be unencrypted.
BestEffort: Use encryption if available otherwise fallback to unencrypted media.
Auto: No media encryption policy is applied.
Default: Auto
Example: xConfiguration Zones Zone 1 DNS SIP Media Encryption Mode: Auto
Zones Zone [1..1000] DNS SIP Poison Mode: <On/Off>
Determines whether SIP requests sent out to this zone will be "poisoned" such that if they are received by the
local VCS again they will be rejected.
On: SIP requests sent out via this zone that are received again by this VCS will be rejected.
Off: SIP requests sent out via this zone that are received by this VCS again will be processed as normal.
Default: Off
Example: xConfiguration Zones Zone 1 DNS SIP Poison Mode: Off
Zones Zone [1..1000] DNS SIP Record Route Address Type: <IP/Hostname>
Controls whether the VCS uses its IP address or host name in the record-route or path headers of outgoing SIP
requests to this zone.
Note: setting this value to Hostname also requires a valid DNS local host name to be configured on the VCS.
Default: IP
Example: xConfiguration Zones Zone 1 DNS SIP Record Route Address Type: IP
Zones Zone [1..1000] DNS SIP SDP Attribute Line Limit Length: <80..65535>
If SIP SDP attribute line limit mode is set to On, sets the maximum line length of a=fmtp SDP lines.
Default: 130
Example: xConfiguration Zones Zone 1 DNS SIP SDP Attribute Line Limit Length: 130
Zones Zone [1..1000] DNS SIP SDP Attribute Line Limit Mode: <On/Off>
Determines whether requests containing SDP sent out to this zone will have the length of a=fmtp lines restricted.
On: the length will be truncated to the maximum length specified by the SIP SDP attribute line limit length setting.
Off: the length will not be truncated.
Example: xConfiguration Zones Zone 1 DNS SIP SDP Attribute Line Limit Mode: Off
Cisco VCS Administrator Guide (X7.2) Page 443 of 498