This clearly wasn't designed by telephony people. It's very web-like. The authentication info is bigger than the call data required to set up a call.
Mostly this is for VOIP. Telcos with TDM or CDMA transmission have serious backwards compatibility problems. Ones who peer only with SS7 have problems but those can probably be overcome.
One big problem is that there are off-brand telcos who specialize in services for call centers. "The Dialer Hardware is being hosted in our premises at Los Angeles - USA, where we have our own switch and termination facility with over 100 Carriers. We also have a redundant switch in New York connected to LA through a fat Fibre pipe."[1] Do those guys get to sign calls? Or what?
Mostly this is for VOIP. Telcos with TDM or CDMA transmission have serious backwards compatibility problems. Ones who peer only with SS7 have problems but those can probably be overcome.
One big problem is that there are off-brand telcos who specialize in services for call centers. "The Dialer Hardware is being hosted in our premises at Los Angeles - USA, where we have our own switch and termination facility with over 100 Carriers. We also have a redundant switch in New York connected to LA through a fat Fibre pipe."[1] Do those guys get to sign calls? Or what?
[1] http://www.callcentersindia.com/showall-orig.php?value1=1126...