I found a C1861 ISR router and I would like to play with it a learn some telephony.
I signed up for a VOIP service so I have SIP credentials. Is there a simple walkthrough anywhere to set up the SIP so I can plug a POTS phone in the FXS port and be able to place and receive calls? Also anything for configuring an IP phone in a regular switch port?
Thank you any help you may provide.