[mod] Please do not buy any equipment from anybody not licensed in Pakistan for providing VOIP service . VOIP, Telephony , Internet Phone Calls are all highly regulated in Pakistan and people are known to end up in jail for using unauthorized equipment and systems to make Internet Phone calls. [/mod]
For more details read these articles:
State of Telecom Industry in Pakistan VOIP in Pakistan: Free Calls to Pakistan a reality?
State of Telecom Industry in Pakistan VOIP in Pakistan: Free Calls to Pakistan a reality?
Here is a list of some authorized providers in Pakistan.
DID Service Providers in Pakistan - voip-info.org
For further details visit:
Home - Pakistan Telecommunication Authority