Cisco Cisco Expressway Maintenance Manual
Setting
Description
Default
Zone
types
types
Send empty
INVITE for
interworked
calls
INVITE for
interworked
calls
Determines whether the Expressway generates a SIP INVITE message
with no SDP to send via this zone. INVITES with no SDP mean that the
destination device is asked to initiate the codec selection, and are used
when the call has been interworked locally from H.323.
with no SDP to send via this zone. INVITES with no SDP mean that the
destination device is asked to initiate the codec selection, and are used
when the call has been interworked locally from H.323.
On: SIP INVITEs with no SDP are generated.
Off: SIP INVITEs are generated and a pre-configured SDP is inserted
before the INVITEs are sent.
before the INVITEs are sent.
In most cases this option should normally be left as the default On.
However, some devices do not accept invites with no SDP, so for these
zones this should be set to Off.
However, some devices do not accept invites with no SDP, so for these
zones this should be set to Off.
Note that the settings for the pre-configured SDP are configurable via the
CLI using the xConfiguration Zones Zone [1..1000]
[Neighbor/DNS] Interworking SIP
CLI using the xConfiguration Zones Zone [1..1000]
[Neighbor/DNS] Interworking SIP
commands. They should only be
changed on the advice of Cisco customer support.
On
Neighbor
DNS
DNS
SIP poison
mode
mode
On: SIP requests sent to systems located via this zone are "poisoned"
such that if they are received by this Expressway again they will be
rejected.
such that if they are received by this Expressway again they will be
rejected.
Off: SIP requests sent out via this zone that are received by this
Expressway again will not be rejected; they will be processed as normal.
Expressway again will not be rejected; they will be processed as normal.
Off
Neighbor
Traversal
client
Traversal
server
DNS
Traversal
client
Traversal
server
DNS
SIP
encryption
mode
encryption
mode
Determines whether or not the Expressway allows encrypted SIP calls on
this zone.
this zone.
Auto: SIP calls are encrypted if a secure SIP transport (TLS) is used.
Microsoft: SIP calls are encrypted using MS-SRTP.
Off: SIP calls are never encrypted.
This option should normally be left as the default Auto.
Auto
Neighbor
SIP REFER
mode
mode
Determines how SIP REFER requests are handled.
Forward: SIP REFER requests are forwarded to the target.
Terminate: SIP REFER requests are terminated by the Expressway.
Forward Neighbor
SIP SDP
attribute line
limit mode
attribute line
limit mode
Determines whether requests containing SDP sent out to this zone have
the length of a=fmtp lines restricted.
the length of a=fmtp lines restricted.
On: the length is truncated to the maximum length specified by the SIP
SDP attribute line limit length setting.
SDP attribute line limit length setting.
Off: the length is not truncated.
The SIP SDP attribute line limit option should normally be left as the
default of Off. However, some systems cannot handle attribute lines longer
than 130 characters, so it must be set to On for connections to these
systems.
default of Off. However, some systems cannot handle attribute lines longer
than 130 characters, so it must be set to On for connections to these
systems.
Off
Neighbor
DNS
DNS
SIP SDP
attribute line
limit length
attribute line
limit length
If SIP SDP attribute line limit mode is set to On, sets the maximum line
length of a=fmtp SDP lines.
length of a=fmtp SDP lines.
130
Neighbor
DNS
DNS
SIP multipart
MIME strip
mode
MIME strip
mode
Controls whether or not multipart MIME stripping is performed on requests
from this zone.
from this zone.
This option should normally be left as the default Off.
Off
Neighbor
Cisco Expressway Administrator Guide (X8.5.2)
Page 130 of 403
Zones and neighbors
Configuring zones