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What must be observed with codec selection with H.323 FastConnect procedure in case of overlap dialing?
Posted by Elena Brambilla, Last modified by Daniel Lizaola on 12 December 2017 04:56 PM
When using H.323 FastConnect (which is usually the case) together with overlap dialing the voice codec is sometimes not known to the B-side SmartNode in the route lookup. The configuration fragment below exemplifies how to configure a SmartNode such that it also accepts such incoming calls: 
context cs
  no number-prefix national
  no number-prefix international
  use tone-set-profile default
...
interface h323 h323_1
  routing dest-interface bri1
  remoteip 172.19.128.21
  codec g711alaw64k


interface h323 h323_2
  routing dest-interface bri1
  remoteip 172.19.128.21
...
gateway h323
  codec g711alaw64k 10 20
  faststart
  no ras  gatekeeper-discovery auto
  bind interface eth0 router
  use voip-profile default
  no shutdown

The bold section shows an H.323 interface without codec. This interface is used by the B-side SmartNode in case overlap dialling is used on the A-side and FastConnect is enabled.
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