140 Matrix ETERNITY NE System Manual
If you allow PUBLISH subscription for a SIP Extension, you must also enable Authentication of PUBLISH.
7. Keep the check box Authenticate PUBLISH enabled, if you enabled Allow Publish. Default: Enabled.
8. Select the check box Allow Presence Subscription to enable the Presence Subscription on the SIP
Extension. Default: Disabled.
When Presence Subscription is enabled on a SIP Extension, the extension user can view the status of
other SIP-enabled Terminals, i.e. whether or not they are available.
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.
9. Select Vocoders
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in the order of preference from the drop down box.
The Vocoders supported by ETERNITY in the order of preference, i.e. 1st to 7th, by default are:
• G.723
• G.729 AB
•GSM FR
• iLBC - 30 ms
• iLBC - 20 ms
•G.711 Law
• G.711 A - Law
If you do not want to select any Vocoder, you can select the option 'None'. However, if all Vocoder
Preferences from 1 to 7 are set to 'None', incoming and outgoing calls will be blocked.
10. If you selected G.723 codec as a Preferred Vocoder, select G.723 Bit Rate as: Bit Rate: 5.3 Kbps or 6.3
Kbps. Default: 6.3kpbs.
When G.723 is negotiated, the selected Bit Rate will be applied only when sending the RTP packets.
When receiving RTP packets from the remote end, both Bit Rates of G.723 will be accepted.
11. To suppress ‘Silence’ packets and allow only Voice packets through, select the check box Silence
Suppression. Default: Disabled.
• ETERNITY NE supports Silence Suppression for all Vocoders except GSM FR.
• Silence Suppression must be disabled if you have selected 'Pass Through' as the "Fax Type".
12. Select the appropriate DTMF Option from the three DTMF types supported by ETERNITY: RTP (RFC
2833) or SIP Info, or InBand. Default: RTP (RFC2833).
The DTMF type determines how the DTMF digits will be sent over the IP Network, when a DTMF digit is
pressed.
13. To apply Echo Cancellation for SIP to CO trunk calls, SIP to Digital Trunks (Mobile, SIP) and Extensions
(SIP, SIP).
• Keep the check box Echo Cancellation enabled. Default: Enabled.
34. 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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