Can't call webcalldirect phone via Sipbroker

[boatman]

Should I be able to call my webcalldirect phone from a Voxalot phone through Sipbroker?

I can direct IP dial to my webcalldirect phone from an unregistered line on my PAP2 by dialing user-id@sip.webcalldirect.com (I do the IP dial by placing the dial string into a speed dial slot in my PAP2). Since the IP dial works, why can't I also reach my webcalldirect phone through Sipbroker by sending the call to *7759user-id@sipbroker.com ?

Note that in the above example I have replaced my actual webcalldirect phone number with 'user-id', however my actual webcalldirect user ID has no digits, it is all alphabetic characters.