[cisco-bba] Connecting Router remotely

[Özcan ILIKHAN]

Hi Everyone, 
We have Cisco 1721 with 2 adsl line (dynamic IP) in our office, sometimes I need to connect device to check status or do something, however most of the time I am away from our office, since IP is not static whenever I need to connect device I am calling office, they give me IP then I connect the device. 
    My question is that is there any way to be  automatically informed about Router's IP after router have been restarted? or getting static IP is the only way to know Router IP?

Thanks.
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