Cisco 7200/7500
For enterprises seeking a high capacity and performance VoIP solution, the 7200
series routers are a viable choice.The Cisco 7200 with six slots can be equipped
with up to 20 T1s or 18 E1s, supporting voice-over-packet applications.The DS0
channel from a T1/E1 is switched into the Digital Signal Processor (DSP) to perform
the TDM-to-packet conversion of the bearer information present on a
DS0, while the Cisco 7200 router supports two types of port adapters, one with
DSPs and one without.The adapters without DSPs can use DSPs from the other
DSP-capable adapters.The PA-MCX-2/4/8 TE1 is a non-DSP adapter and
works with the PA-VXx-2TE1+ type adapters.The PA-VXx-2TE1+ adapters,
on the other hand, provide up to two T1 or E1 interfaces.Table 3.7 lists the
number of voice channels supported, based on the CODEC complexity.