Cisco Cisco Expressway Maintenance Manual

Setting

Description

Default

Zone types

SIP UDP/IX
filter mode

Determines whether INVITE requests sent to this zone filter out
UDP/UDT/IX or UDP/DTLS/UDT/IX. This option may be required to enable
interoperability with SIP devices that do not support the UDP/UDT/IX or
UDP/DTLS/UDT/IX protocol.

On: any media line referring to the UDP/UDT/IX or UDP/DTLS/UDT/IX
protocol is replaced with RTP/AVP and disabled.

Off: INVITE requests are not modified.

We recommend that SIP UDP/IX filter mode is set to On for:

■

business-to-business calls routed through neighbor zones that
connect to external networks / non-Cisco infrastructure

■

calls that connect internally to Unified CM 8.x or earlier (use Off
for 9.x or later)

Off

Neighbor
DNS

SIP record
route address
type

Controls whether the Expressway uses its IP address or host name in the
record-route or path headers of outgoing SIP requests to this zone.

IP: uses the Expressway's IP address.

Hostname: uses the Expressway's System host name (if it is blank the IP
address is used instead).

Neighbor
DNS

SIP Proxy-
Require
header strip
list

A comma-separated list of option tags to search for and remove from
Proxy-Require headers in SIP requests received from this zone.

None

Neighbor

Zone Configuration: Pre-Configured Profile Settings

The table below shows the advanced zone configuration option settings that are automatically applied for each of the
pre-configured profiles.

Setting

Cisco Unified
Communications
Manager

Cisco Unified
Communications
Manager (8.6.1
or later)

Nortel
Communication
Server 1000

Infrastructure
device

Default

Monitor peer status

Yes

Call signaling routed mode

Always

Auto

Always

Auto

Automatically respond to
H.323 searches

Off

Automatically respond to SIP
searches

Off

Send empty INVITE for
interworked calls

SIP poison mode

Off

SIP encryption mode

Auto

SIP REFER mode

Forward

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Cisco Expressway Administrator Guide