SIP PH switch over
A SIP PH switch over can be automatic (fail-over) or manual
operation (manual switch over). It switches the serving SIP PH to the
non-serving SIP PH, and switches the non-serving SIP PH to the
serving SIP PH.
Switch over from the serving SIP PH to the non-serving SIP PH
occurs in 3 seconds or less.
A 5 minute timer is started following a switch over as a result of auto
ping failing in the serving SIP PH. The timer is used to prevent ping
failures on the new serving SIP PH from attempting continual
switches. However, the timer does not prevent a manual switch over
or a switch over due to a failure condition.
When the timer expires, the following can occur.
• If ping is up on the serving SIP PH, nothing occurs.
• If ping is down on the serving SIP PH and the other SIP PH is
non-serving, a switch over occurs even if the non-serving SIP PH
had a previous known ping failure.
• If ping is down on the serving SIP PH and the other SIP PH is
unavailable, no switch over occurs.
The following failure conditions cause the serving SIP PH to do a SIP
PH switch over:
• service selection state changes to unavailable (e.g., Ethernet link
failure or SIP PH card failure), and
• loss of ping and the timer has expired.
A switch over does not occur when the service selection state of the
non-serving SIP PH changes to unavailable.
Service Selection
The service selection state for a SIP PH indicates its ability to support
or handle signaling services. The SIP PH may transition to another
state automatically or manually by the switch personnel.
Hardware View
Architecture
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2-32
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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