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Setup a tunck SIP between two gateways from differents manufacturers

Dear,

 

We just install and first time a Yeastar S100 in our office in Cairo.

In Paris, we have Sonus SBC 1000 , both office are connected by VPN IPSEC connexion.

I would like that users from Paris can call the users in Cairo by extensions and Vis-Versa

the second needed implement the least cost between two sites by reduce the call cost.

 

Can you please supply me by any documentation or send a step by step.

 

many thx

 

 

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