asterisk users - Oct 2008 - Realtime : switch any context dynamically

when i wnat to working with asterisk realtime and mysql  
for any context i have to insert (switch => Realtiem/context at extensions)
statment into extensions.conf

for example if i want to have 10 context,i have to insert these lines into
extension.conf :

[context1]
switch => Realtiem/context1 at extensions

[context2]
switch => Realtiem/context2 at extensions

[context3]
switch => Realtiem/context3 at extensions

.................

.................

i want to switch these 10 context whithout insert these 10 lines ....

how can  we  switch any context to real time dinamically ? 



      
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