Technology

Emergency Stand-Alone (ESA)

The MALC is equipped with the Emergency Standalone (ESA) feature that allows it to provide features when communication to the Class 5 or Softswitch is interrupted. If the uplink to the network is broken, the MALC continues to provide basic call routing and calling features.

Two topologies are currently supported:

• RT-MALC to a Media Gateway via Softswitch using SIP (ESA if link to Softswitch/Media Gateway is broken)
• RT-MALCs to COT MALC with VG using SIP PLAR (ESA if link to COT MALC is broken)

For POTS to GR303 connections, the ESA feature enables numbers configured within the same dialplan using the same MALC device to communicate with any residences or businesses sharing that dialplan. Incoming calls from outside the ESA group and outgoing calls to numbers outside the SIP dialplan receive a fast-busy signal. When ESA is activated, call features, such as call waiting, are not supported. Note: After a loss of connection to the SIP server, there may be a delay up to 5 minutes before ESA notification is received and ESA features are accessible

For VoIP SIP or SIP PLAR connections, the ESA feature enables numbers configured within ESA dialplans to communicate with any residences or businesses specified as the destination of the dialplans in an ESA cluster of MALC devices.