144 Matrix ETERNITY NE System Manual
• Keep the Authenticate SUBSCRIBE check box enabled for Authentication of SUBSCRIBE Request in
SIP Messages. Default: Enabled.
Make sure you have configured the Authentication ID for the SIP Extension.
• Keep the Shared Call Appearance (SCA) Subscription check box enabled, if you want to register this
SIP extension with the same SIP ID at more than one location
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. Default: Enabled.
Shared Call Appearance provides notification on call states to all the phones registered with the same SIP
ID at different locations. To know more about this feature, see “Shared Call Appearance” topic.
This feature is supported on Open Standard SIP Phones only.
• Keep the Voice Mail (VM) Subscription check box enabled, to provide the voice mail facility to the SIP
Extension. Default: Enabled.
You may clear this check box, if required.
• Keep the Allow Busy Lamp Field
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(BLF) Subscription check box enabled, to allow the SIP Extension
to monitor the status of another extension or Trunk. Default: Enabled.
Clear this check box, if you do not want the SIP Extension to monitor the status of another extension or
Trunk.
• Select the Allow PUBLISH check box to allow the SIP extension user to choose whether or not to show
their Presence Status to other SIP Extensions. Default: Enabled.
If you allow PUBLISH subscription for a SIP Extension, you must also enable Authentication of PUBLISH.
• Keep the check box enabled, if you have enabled Allow Publish. Default: Disabled.
Make sure you have configured the Authentication ID for the SIP Extension.
• Keep the Allow Presence Subscription check box enabled, to allow the SIP Extension to view the
presence status of other SIP-enabled Terminals, that is, whether they are available or not. Default:
Disabled.
The SIP Extension for which you have enabled Presence Subscription will be able to view Presence of
only those SIP Extensions which have PUBLISH enabled.
• Select Vocoders
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in the order of preference from the drop down box.
The Vocoders supported by SARVAM UCS in the order of preference, i.e. 1st to 7th, by default are:
29. SARVAM UCS allows you to register SIP phones with the same SIP ID at three different locations.
30. Busy Lamp Field (BLF), a typical feature supported by PCM/TDM PBX and Key Telephone Systems, is also supported on SIP
Extensions.
In PCM/TDM PBX and Key Telephone Systems, this feature is typically used by the Operator to monitor the status of another
extension, that is, whether it is available, ringing or busy. The status of the other extensions is indicated on the special function
keys programmed on the Operator's console. This helps the Operator decide whether to place the call, or transfer the call to that
extension, or pick up the call ringing on that extension.
With BLF Subscription enabled on the SIP Extension, the user can monitor the status of another extension or trunk.
31. Vocoders are the various voice codecs used to compress the data in RTP packets for optimum use of bandwidth and for ensuring
voice quality. You can set 7 Vocoder options in the order of preference.
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