Grandstream Networks GXE502X

GXE502X User Manual 7/9/2008

Version 03

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

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 DID Switch: This field is used to route incoming calls when a DID (Direct Inward

Dialing #) is used instead of the account ID. It is very helpful when there are several

DIDs related to the same (static) trunk provided by your SIP Trunk Service Provider.

Note:

All SIP requests are verified by the GXE502X so the User Part of the SIP URI has to

match the account ID or the DIDs. For outgoing calls when DID switch is enabled,

the DID number in the list will be used in the From, Contact and PAI (P-Asserted-

Identity) value.

If a prepend prefix is configured, it will also be used as prefix for the DIDs.

For example, if the DID is +16175669300 and for outgoing calls the service provider

requires “+”, then configure the prepend prefix to “+” and add the DID 16175669300.

Then +16175669300 will be used to match both incoming calls and also outgoing

calls.