[Asterisk-Users] Ser vs Asterisk?

[Rich Adamson]

Could someone give me a 10,000 foot view of what the differences are
between Ser and Asterisk?

I'd like to implement one or the other handle a small number of local
ip phones, tie a couple of asterisk (or ser) machines together across
the Internet, implement a couple of FX gateways (to handle incoming
pstn calls, and for outgoing pstn calls), and use features mostly
common to pbx's. No immediate need for CDR. Voice mail, callerid, etc,
are wanted.  Would like to accept incoming sip calls from anyone on
the Internet that might choose to call.

Would Ser or Asterisk be the most appropriate choice?

Rich