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Type of feature
When you use the Loop Start digital protocol with ports on an Avaya IR, you must have WebLM licenses for each port that uses the protocol.
About the Loop Start digital protocol feature
The Loop Start digital protocol is a standard loop start Foreign eXchange Station (FXS) protocol. An outgoing call is originated by closing the loop between the Tip and Ring leads toward the distant switch and waiting for a signal on the loop leads before sending the digits of the called number. On incoming calls, a loop closure from the distant switch is sufficient to cause the call to route to a predetermined destination.
This protocol is widely supported by customer-based switches, central office switches, and channel banks under names like "line side digital," "FXS," or "off premise station (OPS)." The Loop Start protocol works over digital cards configured as T1 or E1. Switches known to support either or both of the loop start and ground start FXS protocols include Avaya DEFINITY, Nortel Meridian, and Rockwell Spectrum.
T1 Loop Start provides 24 voice channels per trunk. E1 Loop Start provides 30 voice channels per trunk between a customer-based switch and the Avaya IR system.
Hardware requirements
At least one digital telephony card must be installed and operational.
Software requirements
The Loop Start digital protocol feature requires the NMS package (AVnms). For more information, see NMS package.
Setup considerations
When Loop Start is used to provide an ASAI link between the Avaya IR system and a switch, a separate path must be provided for communications between the two systems. The path must be provided by a MAPD connected to a local area network.
The following limitations apply when you use a line side digital interface:
Application development considerations
The following considerations apply to application development for Loop Start:
Using this feature
Administer this feature using Web Administration (Configuration Management > Switch Interfaces > Digital Interfaces) or the nms command.
