How do I restrict the source trying to access a port?

I have VoIP phones in my office and I am experiencing dozens of hacking attempts per day.  I received the following email from the company that I purchase service from:
Hi ,
Based on our research and experience with these type of calls, these are hacking attempts usually using a program called SIP Vicious or a variant. You can  check the link below about SIP Vicious.
http://threatpost.com/hackers-pushing-sipvicious-voip-tools-malicious-attacks-08 3111/
These attacks for the most part do not affect users behind our managed routers since we have security features in place to block them.
The calls that the remote users are getting do not  traverse the Broadcorenetwork at all. Meaning even if the user put the phone on  DND or we try to block calls through the Web portal, calls will still go through because the call does not go through our Session Border Controller ( SBC ) .
The call is directly hitting the IP of the remote users router (bypassing Broadcore completely) and scanning the ports for a SIP device which is the Polycom Phone. Once they get an answer back from the phone, the hacker  now has a target to attack. What they want to do is get the credentials for the user so they can authenticate a soft phone for example and make free calls.
Unmanaged network /Router limits us of how we can block these calls  , however we have a suggestion which could help you eliminate these calls.
What the remote user can do is to implement this policy . Allow UDP protocol on port 5060 but the only source should be west.broadcore.com.
Since the remote user uses his/her own router, you might need help from their respective support team.
Thank you,
How do I set up the port mapping to only allow incoming traffic from the specified source west.broadcore.com?
Also, is there some sort of documentation, manual, web site or book that covers what the settings of the Airport are?  In detail?  So, that I can learn for myself what is what and be able to answer my own questions such as:  Timed Access - Does this only apply to Wi-Fi or does it disable to whole router during the restricted period?
Thanks in advance,
Noa
By the way I'm using the  Airport Express 802.11n Wi-Fi (2nd Generation), Firmware 7.6.4, Airport Utility 6.3.4 on my Mac or the latest version on my iPhone 6.

What the remote user can do is to implement this policy . Allow UDP protocol on port 5060 but the only source should be west.broadcore.com.
Unfortunately, Apple routers are quite simple, and do not have the features and settings that you would need to do this.
However, if you are using a modem/router or gateway device with the AirPort Express, then you might be able to set up the modem/router to do what you need. What is the make and model number of the device that you likely call your "modem"?

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