[Asterisk-Users] Calculating required bandwidth

[Kevin P. Fleming]

Andrew Kohlsmith wrote:

> RTP has 12 octets all its own, and still need 12 bytes of IP overhead, so it 
> is actually costlier: I'll spare you all the calculations but it's 20 
> channels of SIP G.711 audio per T1, likely with enough room for 
> signalling.  :-)

And you can't run straight IP over a T1 circuit either; it's usually 
framed in HDLC frames. There's a little more overhead for you <G>