Configuring Encapsulation for Voice Services
Voice services interfaces support the following logical interface encapsulation types:
- Multilink Point-to-Point Protocol (MLPPP), which is the default encapsulation
- ATM2 IQ MLPPP over AAL5 LLC
- Frame Relay PPP
For general information on encapsulation, see the Junos® OS Network Interfaces. You can also configure physical interface encapsulation on voice services interfaces.
To configure voice services encapsulation, include the encapsulation statement:
You can include this statement at the following hierarchy levels:
- [edit interfaces interface-name unit logical-unit-number]
- [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]
For voice services interfaces, the valid values for the type variable are atm-mlppp-llc, frame-relay-ppp or multilink-ppp.
You must also configure the physical interface with the corresponding encapsulation type, either Frame Relay or PPP. LSQ interfaces are supported by the following physical interface types: ATM2 IQ, DS3, E1, E3, OC3, OC12, STM1, and T1, including the channelized versions of these interfaces. For examples, see Examples: Configuring Voice Services.
 | Note: The only protocol type supported with frame-relay-ppp encapsulation is family mlppp. |
