# Asterisk Project : PLC Tips

Added by mdavenport , edited by mdavenport on Aug 31, 2010

One of the restrictions mentioned is that PLC will only be used when two audio channels are bridged together. Through the use of Local channels, you can create a bridge even if the call is, for all intents and purposes, one-legged. By using a combination of the /n and /j suffixes for a Local channel, one can ensure that the Local channel is not optimized out of the talk path and that a jitter buffer is applied to the Local channel as well. Consider the following simple dialplan:

    [example]
    exten => 1,1,Playback(tt-weasels)
    exten => 2,1,Dial(Local/1@example/nj)

When dialing extension 1, PLC cannot be used because there will be only a single channel involved. When dialing extension 2, however, Asterisk will create a bridge between the incoming channel and the Local channel, thus allowing PLC to be used.