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====== PBX ======
This page is used to configure the connection between the DV2000 and a SIP-enabled PBX.

{{:images:vs8:vsconfig:telephony-sip.png?direct|}}

===== Local Settings =====

^Setting^Description^
|//Port//|Port number system should listen for SIP communication on. Default is 5060|
|//Transport Protocol//|SIP typically communicates via UDP which is the default. If the PBX is configured for TCP only then choose TCP.|

===== PBX Settings =====
^Setting^Description^
|//Address//|IP address or DNS name of the PBX.|
|//Port//|Port number PBX listens on for SIP communication on. Default is 5060|
|//Expiration Time//|Enter the time, in seconds, the channel will wait between registrations with the PBX. \\ \\ SIP endpoints (channels) are required to maintain registration with the PBX in order to have calls routed to them.  Adjust this setting to be less than the maximum for your PBX. For example, the older Avaya IP Office system default to 180 seconds, while other PBX systems have an expiration time of 3600 seconds.\\ \\ //The default value is **3600** seconds.//|
|//Realm//|Enter the realm with which your SIP PBX is configured. This is **NOT** the DNS domain. For example Asterisk realm should be set to //asterisk// while Avaya IP Office is //ipoffice//.|
|//Domain//|Optionally enter a domain which accounts use to login as. This is typically not set and SIP accounts are just the extension number. In some cases the account might be something like //2001@casino.com//. In this case you would enter casino.com and choose to register accounts using the domain field.|
|//Register accounts using//|Line configuration does not support the ability to enter the full address of each line. Having the setting here rather than on each line also provides quicker numerical configuration of the accounts. \\ Examples: \\ //PBX address:// 2001@192.168.11.67 \\ Local IP adresss: 2001@192.168.11.100 \\ Domain: 2001@casino.com|

===== Security =====
|//TLS Key File//|Path to the TLS key file to use. Leave blank unless using TLS.|
|//TLS Cert File//|Path to the TLS certificate file to use. Leave blank unless using TLS.|

===== Proxy server =====
These settings are optional and typically only used when connecting to a PBX which exists on the internet rather than locally.
^Setting^Description^
|//Address//|IP address or DNS name of the proxy server.|
|//Port//|Port number proxy server uses for SIP communication on. Default is 5060|

Use this table to enter up to 10 additional backup SIP registrars, with which the system can register if the main PBX/server goes offline.  This is entirely optional.\\ \\ The //Order// column indicates the order in which the servers will be checked; always configure them in the desired order of precedence, starting with server 1.  For each server, enter its IP address or DNS name.\\ \\ **All backup servers must use the same port number, realm, expire time and transport protocol as the main server.**