While free voip calls to Pakistan remain a distant dream however still you can call Pakistan cheap.
Pennytel.com is offering call rates as low as 9 US cents per minute. And the best thing that billing is per second not per minute. Both dialer based and sip besed calling is allowed.
So call your loved ones and save heaps.

User name : (your mediaringtalk Id)
Password : ( your password)
Authorization user name: (your mediaringtalk id)
Domain : sip1.mediaringtalk.com

Please choose codec as g723. Currently it is only found to be working with g723 codec. So sip software and hardware with g723 codec will only with mediaringtalk.com voip service.
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List of Betamax Alternatives which provide cheap/free calls for fixed rental.
We all know betamax can’t be trusted anymore with there without notice tariff changes.

So here goes the list.

1.) Raketu.com Offers 1000 to 1500 free mins for a fixed rental. Charges extra for sip usage. Looks transparent to me. Not tried yet. If you have any review then leave a comment.
2.) Pennytel.com Offers option of per second or per call(to selected destinations) billing. Quite Reliable … I am using them for past six months. Australia based so European customers may face a bit lag(test before buying credits).
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Settings for use of ipkall.com free Usa number with Pennytel.com
Account type: Sip
SIP Phone Number: 88xxxxxxxx
SIP Proxy: incoming.pennytel.com

Sip Settings for Raketu Voip Service
SIP port : 5060
Registrar : 4.78.4.5
Proxy server : 4.78.4.5
Outbound proxy server : leave empty
Account name : your Raksip/RakIn username
Password : your Raksip/RakIn password
Display name/number : your Raksip/RakIn username

Sip Settings for Voipzoom.com of Betamax
SIP port : 5060
Registrar : sip.voipzoom.com
Proxy server : sip.voipzoom.com
Outbound proxy server : leave empty
Account name : your VoipZoom username
Password : your VoipZoom password
Display name/number : your VoipZoom username or voipnumber
Stunserver (option) : stun.voipzoom.com

Free phone calls all around the world:
Download VoipZoom for FREE!

With VoipZoom you can call lots of destinations for FREE for just EURO 2,50 a month. Sign up for VoipZoom and start calling your friends and family in lots of destinations for FREE or at really cheap rates without any hidden costs or long-term contract!

Just follow these 3 easy steps and start saving money:

Register for the VoipZoom service
Buy the EURO 2, 50 credit to call lots of destinations for free for a month (only Credit Card payments are possible)
Start calling!

If your country is not in the FREE list you can still make use of the cheap rates by downloading the VoipZoom software and buy credit which will not expire! If you choose to only call the non-free destinations, you do not need to pay the monthly EURO 2,50 subscription!
http://www.voipzoom.com