Supporting Different Codec and Telephone-Event Rates in the SDP

This procedure shows you how to configure the Enterprise SBC to use different clock for codec and telephone-events when the SDP offer presents rates that are not the same. If allow-diff2833-clock-rate-mode is disabled, the Enterprise SBC does not support differing clock rates. When enabled, the Enterprise SBC can use different rates.

1. In Superuser mode, type configure terminal and press Enter.

   ORACLE# configure terminal

2. Type session-router and press Enter to access those configuration elements.

   ORACLE(configure)#session-router
   ORACLE(session-router)#

3. Type sip-interface and press Enter. The system prompt changes to let you know that you can begin configuring individual parameters.

   ORACLE(session-router)# sip-interface
   ORACLE(sip-interface)#

4. allow-diff2833-clock-rate-mode—Enable this value to specify whether or not the Enterprise SBC can present SDP that contains a telephone-event clock rate that is not the same as the audio codec clock rate. When this parameter is disabled, the Enterprise SBC does not send telephone-event with a different clock rate than audio codec as an answer towards the ingress.
   Values include

   • use-2833-clock-rate—Allow the use of different clock rates and generate RFC2833 packets using the telephone-event clock rate.
   • use-codec-clock-rate—Allow the use of different clock rates and generate RFC2833 packets using the codec clock rate.

   The example below sets the value to use-codec-clock-rate.

   ORACLE(sip-interface)#allow-diff2833-clock-rate-mode use-codec-clock-rate

5. Type done to complete the configuration.
6. Save and activate your configuration.