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How many calls can a T1 handle and what is bandwidth of each call?

I am planning to setup VoIP for my company. I am wondering how many simultaneous calls can be handled by a T1? What is the bandwidth for each call?

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If this is a full data T1 circuit (e.g. PPP) dedicated for VoIP, then you have 1536 Kbps symmetric upstream and downstream speed. If you are going to use G.711 uncompressed speech, then you need about 87 Kbps per call with overhead. You can therefore have about 17 simultaneous calls over that connection.

If you are going to use G.729 compressed voice, then you need about 24 Kbps per call with overhead. You can therefore have about 64 calls on that connection.

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This was first published in November 2005

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