MacPro is unable to call to PC machine for the first time

I have the fllowing problem:
I have two computers One is MacPro machine and other is PC machine. I use Adobe Video Sample Application for Stratus Testing. When I launch the application for the first time on two machines and try to make a call from Mac to PC, nothing happens. PC doesn't receive any calling notification. However, when PC tries to make a call to MacPro machine, everything goes really well.
There is one exception:
MacPro machine can make a call to PC machine with the following condition
1 - PC has already made a call from PC to MacPro.
So, if PC has already made a call to MacPro, then after terminating the call (from anyside), MacPro can call PC and all goes well.
Can anybody please let me know why for the first time, MacPro is unable to call PC machine?
Thanks in advance.

Thanks for the reply. Let me elaborate the environment I have. I have a Wifi Network and the following three machines
MacPro (about which I have already discussed)
PC (about which I have already discussed)
Macbook
For your information, MacPro and Mac can easily talk with each other without any problem. Problem occurs when within the same WiFi network, MacPro tries to connect with PC.
I hope this will help you all a lot to guide me. Im also going to read the tutorial you have provided me.
Looking ahead from your side.
Thanks a lot again.

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http://blog.fosketts.net/2010/08/11/time-machine-completed-verification-backups- improve-reliability-time-machine-create-backup/
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http://www.theinternetpatrol.com/the-dreaded-time-machine-has-completed-a-verifi cation-of-your-backups-to-improve-reliability-time-machine-must-create-a-new-ba c kup-for-you-message-and-why-you-are-seeing-it/
Time Machine: About "Time Machine completed a verification of your backups. To improve reliability, Time Machine must create a new backup for you."...
http://support.apple.com/kb/HT4076
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Get carbon copy cloner to make an exact copy of your old HD to the New one...
http://www.bombich.com/software/ccc.html
Or SuperDuper...
http://www.shirt-pocket.com/SuperDuper/
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http://www.tri-edre.com/english/products/tribackup.html

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