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-Overview
--------
-Asterisk currently supports configurable RTP packetization per codec for
-select RTP-based channels.
-
-Channels
--------
-These channel drivers allow RTP packetization on a user/peer/friend
-or global level:
- chan_sip
- chan_skinny
- chan_h323
- chan_ooh323 (Asterisk-Addons)
-
-Configuration
--------
-To set a desired packetization interval on a specific codec,
-append that inteval to the allow= statement.
-
-Example:
-allow=ulaw:30,alaw,g729:60
-
-No packetization is specified in the case of alaw in this example,
-so the default of 20ms is used.
-
-Autoframing
--------
-In addition, chan_sip has the ability to negotiate the desired
-framing at call establishment.
-
-In sip.conf if autoframing=yes is set in the global section, then
-all calls will try to set the packetization based on the remote
-endpoint's preferences. This behaviour depends on the endpoints
-ability to present the desired packetization (ptime:) in the SDP.
-If the endpoint does not include a ptime attribute, the call will
-be established with 20ms packetization.
-
-Autoframing can be set at the global level or on a user/peer/friend
-basis. If it is enabled at the global level, it applies to all
-users/peers/friends regardless of their prefered codec packetization.
-
-Codec framing options
--------
-The following table lists the minimum and maximum values that are
-valid per codec, as well as the increment value used for each.
-Please note that the maximum values here are only recommended
-maximums, and should not exceed the RTP MTU.
-
-Name Min Max Default Increment
-g723 30 300 30 30
-gsm 20 300 20 20
-ulaw 10 150 20 10
-alaw 10 150 20 10
-g726 10 300 20 10
-ADPCM 10 300 20 10
-SLIN 10 70 20 10
-lpc10 20 20 20 20
-g729 10 230 20 10
-speex 10 60 20 10
-ilbc 30 30 30 30
-g726_aal2 10 300 20 10
-
-Invalid framing options are handled based on the following rules:
- 1. If the specified framing is less than the codec's minimum, then
- the minimum value is used.
- 2. If the specific framing is greater than the codec's maximum, then
- the maximum value is used
- 3. If the specificed framing does not meet the increment requirement,
- the specified framing is rounded down to the closest valid
- framing options.
- example allow=ulaw:33 will set the codec to 30ms framing
- 4. If no framing is specified in the allow= directive, then the
- codec default is used.