asterisk users - Jan 2008 - not understanding Cisco call manager connection for incoming calls

I am connected to CCM and have a sip.conf entry like:

[CCMHEART]
type=friend
host=X.y.X.A
allow=ulaw
allow=alaw
allow=all
canreinvite=yes
qualify=yes
context=CCMHEART

In extensions.conf I have a context of:

[CCMHEART]
exten => s,1,Goto(default,s,1)

exten => 45801,1,Goto(default,s,1)
exten => 4545801,1,Goto(default,s,1)

I do have a default context.

However calling the above 4545801 number asterisk
does not answer as it says it cannot find the 45801
in the current context.

Once I put the 3 context lines above in the default context
asterisk answers just fine.

Why do I need to put the 3 lines in the default context?
The sip.conf entry has the context being "CCMHEART" shouldnt it look
there?

Jerry