Avaya Media Gateway G250, Руководство администратора, Страница: 142 / 840

Configuring Standard Local Survivability (SLS)
142 Administration for the Avaya G250 and Avaya G350 Media Gateways
Using contact closure in SLS mode
When the media gateway is in survivable mode, contact closure works as follows:
1. Lift the phone receiver and listen for the survivability dial tone.
2. Dial the appropriate contact closure FAC (open, close, or pulse) on the phone.
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If you dial an invalid FAC code, then SLS plays an intercept tone and terminates the
session.
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If you dial a valid FAC code, then you will hear a standard dial tone and can proceed to
Step 3.
3. Dial the media gateway number (three digits).
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If you enter fewer than three digits, then SLS times out and you must restart this
procedure from the beginning.
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If the media gateway number matches the local media gateway number, then SLS
plays a standard dial tone and you can proceed to Step 4.
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If the media gateway number does not match the local media gateway number, SLS
plays an intercept tone and terminates the session.
4. Dial the contact closure code, for example 1 for contact pair #1, and 2 for contact pair #2.
You hear stutter tone and then silence, confirming these valid codes. If you dial an invalid
contact closure number, you will hear an intercept tone.
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Contact closure feature activations appear in the CDR log (see Figure 7 ).
Note:
Note:
If the contact closures are set to manual operation, the FAC operation will not
work even though the confirmation tone is heard. However, an event will be
logged.
Contact closure / SLS feature interactions
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There is no screening to authorize the use of the contact closure feature in SLS mode.
Security is provided by limiting the number of users who know the correct key sequence
required for the contact closure feature.
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You cannot use the Hold or Transfer features while dialing the contact closure FAC key
sequence.
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Contact closure will not work until you dial the full digit sequence and it is processed.
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If two users try to simultaneously use contact closure, whoever dials the full FAC key
sequence first gets precedence.
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Interdigit timing rules apply to the contact closure feature, so if you pause too long during
the FAC key sequence, the feature times out.
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Call appearances are not released (available for calls) until you hang up.