To configure the physical interface for PPP encapsulation, you also need to specify the services interface to be used for voice compression; on M-series and T-series routers, the Link Services IQ (lsq) interface type is used, and on J-series Services Routers, the Link Services (ls) interface type.
To configure the compression interface, include the compression-device statement:
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compression-device interface-name;
You can configure this statement at the following hierarchy levels: