[asterisk-users] G.729 codec between avaya and asterisk

[satish patel]

Dear all
   
          i have asterisk connected with avaya through E1 back-2-back now when i configure my sip client with g.729 codec then i m not able to put call from asterisk to avaya and when i user g.711 it is working fine so i dont know why i need G.729 on E1 Trunk it is TDM technologies then why my call fail in g.729 case 
   
   
  [sip_phone]------[asterisk]-----E1----[Avaya]----[analog_phone]
   
  Asterisk sip client configure with g.711 alaw/ulaw
  Avaya phone client configure g.711 alaw/ulaw
   
  suggest how do it implement g.729 on this case what change i have to done on both part

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