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How does voice codec selection for H.323 work with SmartWare?
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 05:00 PM
The selection of a specific codec is somewhat tricky with the H.323 protocol. In SmartWare a specific codec can be entered at 2 different locations:
a. in the h323 gateway configuration
b. in the h323 interface configurationThe following example exemplifies a typical configuration: 
...
interface h323 myif
  routing dest-interface isdn
  codec g711alaw64k
  use tone-set-profile default
...
gateway h323
  alias h323-id inalp1400
  alias e164 01233000
  codec g723_6k3 30 30
  codec g729
  faststart
  ras
  gatekeeper-discovery manual 172.19.32.42 1719 RRS
  bind interface eth0 router
  no shutdown
  use voip-profile default

The codec configuration in the gateway specifies the 2 codecs G.723 6.3kbps and G.729 as the set of allowed codecs. This set of codecs is sent to the remote H.323 gateway (or gatekeeper) during the capability exchange phase. The codec specified in the interface 'myif' is the preferred codec to be used. SmartWare places this codec is on top of the list of allowed codecs which is sent during the capability exchange phase. Note that the preferred codec specification only works when FastConnect procedure is used. Otherwise it is without effect. 
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