[cisco-voip] E1 trunk

[Cisco Voip]

Hi all.
 
Our customer came up with requirement. They have 1 head office and 3 branches. 
All 3 branches are using CME. Headoffice has taken E1 from local telco. Now the 
requirement is,
 
When any person in any of 3 branches, dials 9 (access code), one of the E1 
channels should be allocated to him !!! (if none are free, then he should hear 
busy tone)
 
Is this even possible ? how can a remote CME router can do that ?


      
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