asterisk users - Jun 2004 - Unsupported Media error from iConnectHere

I can't talk through iConnectHere. The connection gets made but as soon as
any sound is transmitted the call ends and the Asterisk console shows an
"Unsupported Media" error as follow:

Got SIP response 415 "Unsupported Media" back from 213.137.73.147

My only allowed codecs are alaw and ulaw. My sip.conf looks like:

[iconnect]
type=friend
secret=xxxx
username=yyyyyyy
host=natrelay.deltathree.com
dtmfmode=inband

[2000]

type=friend
username=2000
secret=xxxxxxxx
host=dynamic
context=from-sip
mailbox=2000
qualify=no
dtmfmode=inband
disallow=all
allow=ulaw
allow=alaw
callgroup=1
pickupgroup=1

Suggestions, please?
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