We have a cisco 3845 router and we are trying to figure out,what all hardware/software components required to configure SRST on this router. Any help would be appreciated.
Anantha Subramanian Natarajan
For an SRST router you will technically only need DSPs (PVDM) if you have an analog connection.
Generally, you will have an analog port for SRST so that phones can dial out of the system, but all you wish to have is intra-system DN reachability, you wouldn't use DSPs.
If this helps clear up the question at all.
Use the DSP calculator to figure out your DSP situation:
Same thing - Packet Voice DSP Module (PVDM). Basically needed for terminating analog calls and transcoding between different codecs. Use the Cisco DSP calculator tool to size the PVBM needed.