[Asterisk-Users] Can a SIP Phone talk directly with anoyher SIP phone (ext a to Ext b)

[cmould]

I am in the proscess of integrating a clients remote and head office 
phone systems. Currenty each office has their own PBX and trunk lines. I 
am recommending that they put in an Asterisk server at the Head office 
with a WAN link to the remote office and switch to IP phones.  Trunk 
lines at the remote site would  be returned to the TELCO. External calls 
over the PSTN from the remote office would be routed over the WAN to the 
head office and through Asterisk to the PSTN trunk lines. All phones 
would then become extensions (both remote and head office locations). I 
want Person A in the remote office to dial an extension number and get 
Person B in the head office. What I am unsure about is if person A and 
Person B are both at the remote site and Asterisk PBX is at the head 
office, can A and B talk directly to each pther without traversing the 
WAN link? Has anyone done this before? What is the quality of the call 
if they have? Any information is useful.
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