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Configuring Compressed Real-Time Transport Protocol (CRTP)

Real-Time Transport Protocol (RTP) can help achieve interoperability among different implementations of network audio and video applications. However, in some cases, the header, which includes the 12-byte RTP header, the IP and UDP header, can be too large a payload on networks using low-speed lines such as dial-up modems. Compressed Real-Time Transport Protocol (CRTP) can be configured on a single link to reduce network overhead on low-speed links.

On the Services Router, CRTP can be configured on a T1 or E1 interface with PPP encapsulation and using the link services interface as a compression device.

To configure CRTP on the Services Router:

  1. Navigate to the top of the interfaces configuration hierarchy in either the J-Web or CLI configuration editor.
  2. Perform the configuration tasks described in Table 31.
  3. If you are finished configuring the router, commit the configuration.

Table 31: Adding CRTP to an E1 or T1 Interface

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Interfaces level in the configuration hierarchy.
  1. In the configuration editor hierarchy, select Configuration>View and Edit>Edit Configuration.
  2. Next to Interfaces, click Edit.

From the top of the configuration hierarchy, create and name the interface:

edit interfaces interface-name

Select an E1 or T1 interface—for example, t1–1/0/0.

Set PPP as the type of encapsulation for the physical interface.

  1. Next to a T1 or E1 interface, click Edit.
  2. From the Encapsulation list, select ppp as the encapsulation type.
  3. Under Unit, click Edit.
  1. Enter

    set encapsulation ppp

  2. Enter

    edit unit 0

Add the link services interface, ls-0/0/0.0 to the physical interface.

  1. In the Compression device box, enter ls-0/0/0.0
  2. Click OK until you return to the Interfaces page.
  1. Enter

    set compression-device ls-0/0/0.0

  2. Enter

    exit

    until you return to the edit interfaces hierarchy.

Add the link services interface, ls-0/0/0, to the Services Router.
  1. Next to Interface, click Add new entry.
  2. In the Interface name box, type ls-0/0/0.
  3. Click OK to return to the Interfaces page.
  4. On the main Interface page, next to ls-0/0/0, click Edit.
  5. Next to Unit, click Add new entry.
  6. In the Interface unit number box, type 0.

From the [edit interfaces] hierarchy level, enter

edit interfaces ls-0/0/0 unit 0

Configure the link services interface, ls-0/0/0, properties.

F-max period —Maximum number of compressed packets allowed between transmission of full headers. It has a range from 1 to 65535.

Maximum and Minimum—UDP port values from 1 to 65536 to reserve these ports for RTP compression. CRTP is applied to network traffic on ports within this range. This is only applicable to voice services interfaces.

  1. Next to Compression, select yes, and then click Configure.
  2. Select RTP, and then click Configure.
  3. In the F-Max period box, type 2500.
  4. Select Port, then click Configure.
  5. In the Minimum value box, type 2000.
  6. In the Maximum value box, type 64009
  7. Click OK.

Enter

set compression rtp f-max-period 2500 port maximum 64009 minimum 2000

For more information about configuring CRTP on a single link, see the JUNOS Network Interfaces Configuration Guide and the JUNOS Services Interfaces Configuration Guide.

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