Installation guide

Synapse Installation Guide Back to Contents
Installation 16
 Port forwarding on your router is configured to route UDP 5060 traffic from the
WAN side to the SIP Gateway LAN IP address.
SIP ALG (application-level gateway) functionality may be required if the SIP service
provider does not use hosted NAT traversal.
About Appearance Modes
The system administrator can configure the Synapse system to operate in one of two
appearance modes: Call Appearance mode and Line Appearance mode. Each mode
affects how Deskset users make, answer, and manage calls. Each mode provides a unique
set of configurable features.
Before beginning the installation, you and the system administrator should decide which
mode will work best for the site.
Call Appearance Mode
In Call Appearance mode, each Deskset has virtual “lines” (5 on SB6703x Desksets, and
up to 10 on SB6702x Desksets) for calls to and from external numbers (232-555-0176,
for example) or other extensions (Extension 220, for example). These virtual lines are
called Call Appearances.
Systems using Call Appearance mode can have any combination of PSTN Gateways, T1
Gateway, SIP Gateway, and optional ATAs. In Call Appearance mode, SB67030/031
Desksets can have SB67040 Cordless Handsets registered. TL7600 Cordless Headsets are
also compatible with Call Appearance mode for all Desksets except the SB67020.
Line Appearance Mode
In Line Appearance mode, each line that Deskset users can access corresponds to an
actual physical line connected to the PSTN Gateway. The Synapse system can have up
to four PSTN Gateways, providing up to 16 lines. Incoming lines are mapped to
programmable feature keys on Desksets. You can assign different lines to different
Desksets or groups of Desksets. You can configure SB6702x Desksets to access up to 9
lines and SB6703x Desksets to access up to 4 lines.
Other Desksets in the system can share these lines and display the line status. Incoming
calls on a line ring at all Desksets that share that line. Users at Desksets that share lines
can see when lines are ringing, busy, or on hold.
Systems using Line Appearance mode must use PSTN Gateways only. The ATA is also
compatible with Line Appearance mode. For more information, see “ATA Fax Line
Configuration” on page 28. A system using Line Appearance mode cannot support the
T1 Gateway, SIP Gateway, Call Queue, and some Deskset-specific features.
For more information, see the Synapse Administrator’s Guide at
www.telephones.att.com/synapseguides.
In Line Appearance mode, SB67030/031 Desksets cannot use SB67040 Cordless
Handsets. TL7600 Cordless Headsets are compatible with Line Appearance mode for all
Desksets except the SB67020.