marcm,
Sipbroker Features:
http://forum.voxalot.com/sip-broker-...r-gateway.html
I have my DID fwd to mysipswitch.com, and there I have added voxalot for free voicemail, sipcodes, siptosip, and inum. I added sipbroker with anon login for free toll-free dialing for my toll free directory assistance, free Sip to Sip SipCodes, and Inum/Enum calling. I also have voipstunt for outgoing. MySipSwitch calls all of my phones and the first to answer gets the call. I don't know if sipbroker is a sip service; as I use the anon.
Here's my dialplan with mysipswitch.
https://www.mysipswitch.com/forum/viewtopic.php?t=1363
SM