DIY -VoIP – Do IT Your Self

“Reduce bandwidth usage of VOIP route up to 80% .. Start saving money !”

 “This SIP calling software has majorly two benefits- first, it helps in bypassing internet firewall and second, it reduces bandwidth consumption by up to 70%…!”

 These are the slogans of some VoIP product seller websites.

Do you believe  if someone says that  there is some technology which reduces 80 % of bandwidth usage  on  a voipcall  which is already encoded with low badnwitdh codecs?. Then why should one wants to pay royaltee fee and use the low bandwidth consumption codecs like g729 and AMR ?.

 Low bandwidth codecs are meant for voice packet compression. You can consider that a  voice packet is already compressed if you are using a low bandwidth consumption codec  .

 I am  pity on some people who are paying  so much money on  some useless VoIP solutions.Some VOIP software developers  are selling nonsense to the customers by keeping the fact  in mind that most of the VoIP customers are non-Tech-savvy .

SIP and RTP headers can be compressed and some of the attributes can be omitted to reduce the packet size . 

Imagine if some one is explaining you about a third person like this

His name is peter , his height is 5.10 , he is wheatish in color “

If the same  would be explained like this 

 “He is peter from india , he is 5.10″ and  60 KG, wheatish complexion. He is married and has 2 kids . He has  compeletd his masters degree from university of Delhi. He is an introvert and has great taste in movies . His hobbies are watching movies , playing football “

Obviously the second introduction  is more detailed and memorable .

Sip ,RTP protocols are defined in internet standard documnets ( RFC 3261,3550 etc., by IETF ).   You can omit some of the attributes in header while developing a sip stack .

You can use silence suppression= on if your  equipment/software supports that.

Using  low bandwidth codecs  will reduce bandwidth coset and improve voice quality.

 If you want to by pass VOIP packets through firewall or blocked networks you can use VPN  solution like OpenVpn .

 Still VPN might be blocked in some coutries… it is not our subject  and I can not discuss  how to hide VOIP packets from ISP s in those countries.



Recently , we have  implemented a openvpn based site to site solution for a customer  as he  has dynamic  internet IP address at one end and also firewalled environment .

This solved 2 problems of his ,One is  dynamic public ip problem  and the other is bypassing VOIP packets through firewall .

We just need to take care of some VPN optimisation things then it will work without a hitch.

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1 Response

  1. Shivendra says:

    Hey, thank you so much for sharing this helpful info with us. This post is good and explained nicely. Recently, I have been purchased VoIP Bandwidth Optimization Software from Telepacket. It is a reliable and effective solution for bandwidth consumption. Visit –

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