GXE502X User Manual 11/2/2009
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o Registration Retry Interval: The expiration time interval for the GXE502X to retry or update
registration. This is usually regulated by the SIP server configured here. Reducing this time
interval will keep registration more synchronized with the SIP server but with the cost of
more registration packets sent to server. The default value is 600 seconds or 10 minutes.
o SIP Transport: This will be the transport method used by the SIP Trunk. This method is
given by the SIP trunk provider. The options are UDP (default), TCP or TLS.
o Heart Beat: if set to Yes, the GXE502X will send a SIP OPTIONS Request frequently to
check whether the SIP Proxy is still online. If the Proxy does not support by answering with
a SIP 200 OK then the GXE502X will consider this trunk as disconnected. This feature is
also used to keep a UDP port open when the GXE502X is behind a NAT firewall.
o Session Keep Alive: This field allows users to enable or disable usage of the session timer.
This is enabled by default to: Automatic/Session Timer.
o Session Expiration: The session timer enables SIP sessions to be periodically “refreshed”
via a SIP request. If enabled, before the session interval expires, the GXE502X will send a
SIP re-INVITE message to the SIP server, if this message is not replied the session will be
terminated. This will avoid stalled sessions occupying the channel/bandwidth. Session
Expiration is the timer (in seconds) at which the session is considered timed out if no
successful session refresh transaction occurs beforehand. The default value is 180
seconds. Incorrect configurations could cause calls to get dropped.
o Min-SE: The minimum session expiration (in seconds). The default value is 90 seconds.
o Use DNS SRV: Default is No. Select “Yes” if the domain name of the SIP server or
Outbound Proxy is compliant with RFC2782. The SIP trunk will not function properly if this
field is not configured correctly.
o Unregister on Reboot: Default is No. If set to “Yes”, The GXE502X will first send a
registration request to remove all previous or multiple bindings by adding “*” in the SIP
Contact Header. Please use this feature ONLY if the proxy supports removal binding
requests. Otherwise the SIP trunk will not function properly.
o Register Active: This parameter controls whether the GXE502X needs to send REGISTER
messages to the Proxy Server before making or receiving calls. The default setting is “Yes”
(for most dynamic SIP trunks).
Note:
For security reasons: If this is set to “No” (for most static SIP trunks) any incoming request
MUST match the SIP server IP or the FQDN resolution must match the sending IP address.
o CBCOM Encryption: If set to Yes, RTP will be encrypted as per the algorithms of CBCOM.
The Default setting is No.
o Incoming Calls Routed by: If set to Requested-URI, then all calls are routed base on the
Request URI field in SIP Invite. If set to To-URI, then calls will be routed base on To-URI,
this is normally the case when To-URI matches the DID assigned to this SIP Trunk.
o ReInvite Delay: This option allows the user to delay the SIP ReInvite sent out by the GXE in
order to finish establishing the call. The delay can be set from 0 to 4 seconds. This is very
helpful in establishing interoperability with certain service providers or platforms who cannot
handle ReInvites too quick.
o Account ID as From Name: If set Yes, then all outgoing calls from this SIP Trunk will use
the Account ID (In this case the account name for SIP Registration) in From Header of the
SIP Invite.
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