Re: Basics: 1861; FXS; FXO, IP Fone and Analog fones
To answer your questions:
1. Yes, you can plug normal analog phones to the FXS ports on the router. The traffic will go wherever you want it to go, based on the number dialed (dial-peer configuration)
2. FXO is used for the line coming in from your telco. These are standard analog POTS lines. If you have a PRI, then you will have to get a VWIC-1MFT-T1/E1 or VWIC-2MFT-T1/E1 card to support the PRI or PRI's.
3. The phone traffic will traverse the WAN if you have implemented site to site dialing or toll bypass, and you have dial-peers configured, which basically tell the router, when number xxxx is dialed, send this call across the WAN, while you may have another dial peer that states when number xxx-xxx-xxxx is dialed, to send this call out to the PSTN.
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