[Asterisk-Users] context being ignored by inbound sip call

[btb]

hello-

i was messing around with a did from ipkall.com, and asterisk seems  
to be ignoring the context specified in the sip config.

in sip.conf, i've added:

[7508] ;ipkall
type = peer
dtmfmode = rfc2833
context = remote
callerid = "ipkall incoming" <7508>
nat = no

in extensions,conf, i have:

[remote]
exten => 7508,1,DISA(1111|internal)

[internal]
exten => 81,1,Dial(SIP/ion,20,tr)
exten => 82,1,Dial(SCCP/82,20,tr)
exten => 83,1,Dial(SIP/quark,20,tr)
exten => 84,1,Dial(SIP/proton,20,tr)
exten => 85,1,Dial(SIP/work1,20,tr)
exten => 86,1,Dial(IAX2/work2,20,tr)

yet when the call arrives, asterisk says:
NOTICE[8100]: pbx.c:1731 pbx_extension_helper: Cannot find extension  
context 'default'

what am i missing?

thanks
-ben