You do know wireshark captures media files on ip telephony right? Or are you so ill trained you have never used the voip telephony filter in wireshark?
Why I used the example of Cisco 8 series is because it is the industry standard, handles sip alg and natting exceptionally well compared to dlink, net gear and drayteks.
So what about interception at the SBC are you telling me that AGM1 and 2 are still secure despite the NSA and other state actors having decypted them back in 2012.
Do you know what BGan is and why I mentioned it? Have you used one because I have and that is why I mentioned bgan because the sat reciever with an lnb is not a satellite broadband terminal.
I know what Wireshark is. It is an exceptional packet analysis tool, you can deploy it to sniff wireless as well as lan and wan traffic on the end point, SBC or tdm link. You need physical access of course, you telling me that our agencies don't have a back door to the Cisco switches for the ISPs Pakistan?
A tpon is more stable when considering voice traffic vid-a-vis adsl with the pathetic 200k upstream you can achieve in Pakistan. To handle a good volume call on g711 you would need a upstream of at least 1 meg, of course you could get by with adsl if you only handle 1 call.
Now then what if you were using a third party SIP trunk with an SBC outside Pakistan, you would physically need to connect a laptop to the Lan side of the SBC to capture the Pcap or on the lan side of the road be point.
Either way as the traffic is being sent via digital traffic it is not analog and so traditional means of using a drip wire tap on the dAcs (google the phrase) your next best option would be to physically have an intercept on the dsalm card at the tele exchange or the ftth cabinet.
Now going forward if you understand networking that is one thin but we are talking telecoms here. If you understand telecoms than you should have been able to comprehend industry terms such as ex, on, DACS, ftth?
Finally when you speak to people try to use a cordial tone because you came across like a dick swinging chootia the kind who get slapped back down to earth very fast
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Also do you think Talibunnies use encryption keys? Come on get real guys we are not talking tetra and sepura handsets here, these are ducking Vphones!