Methods used to handle abnormalities in network-wide orderwire phone dial-up

Question:
When a BWS 1600G system runs for a period, the orderwire phone of a site generates audio squealing, and no ringback tone is played back upon a call to another site. The orderwire phone is restored to normal after all system control boards at the sites are reset multiple times onsite. The same issue, however, occurs shortly again.
Analysis:
1. Run the :cfg-get-phonestat: OHPBid, telsrl command to check the network-wide orderwire phone status. It is found that all orderwire phones at the sites are in meeting state (the queried value is 13).
2. A system based on platform 5.0 cannot force orderwire phones to idle state.
3. When an NE on the network initiates a network-wide conference call,
but another NE at a site is reset or ends the call upon monitoring channel unavailability, other sites will be kept in meeting state and cannot exit.
Answer:
1. Initiate a network-wide conference call at the central site, and end the call after a period. (To counter interference, you can initiate the call multiple times.
2. Run the :cfg-get-phonestat: OHPBid, telsrl command to check the network-wide orderwire phone status. If value 0 is returned, the site has been restored to the idle state. If a site returns value 13, the site is in a conference call and the phone is not hung up properly. When this occurs, instruct the onsite engineers to hung up properly or reset the NE. When the site is restored, initiate a network-wide conference call at the central site, and end the call after a period. Then the orderwire phone at the site is restored to the idle state.
[Note]
1. This issue occurs on a network that uses an SCC board providing both the system control and orderwire service. BWS 320G NEs use separate OHP boards and therefore are not involved in this issue.
2. The following describes the :cfg-get-phonestat: OHPBid, telsrl command:
Parameter OHPBid: slot ID of the orderwire board
Parameter telsrl: Nth channel of orderwire phone (value 1 indicates the first channel for example)
Return value indication:
Orderwire phone status codes:
SPS_IDLE: 0x00 (idle)
SPS_PREDIAL: 0x01 (pre-dial)
SPS_DIAL: 0x02 (dialing)
SPS_ROUTES: 0x03 (addressing)
SPS_RING: 0x04 (ringing)
SPS_ALERT: 0x05 (alerting or ringback)
SPS_PRETALK: 0x06 (pre-talk)
SPS_TALK: 0x07 (talk)
SPS_PRERELEASE: 0x08 (pre-release)
SPS_BUSY: 0x09 (busy)
SPS_THROUGH: 0x0a (pass-through)
SPS_MEET: 0x0b (meeting)
SPS_MEETSTART: 0x0c (meeting start)
SPS_MEETTALK: 0x0d (meeting talk)
SPS_MEETEND: 0x0e (meeting end)
SPS_PRERELEASE2: 0x0f (pre-release)

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