I have a client who has recently established voice over ip. Apparently someone has told him that we can achieve voice compression using tcp/ip header compression. So he asked me and I'm trying to give him a satisfactory answer but I can't find any crucial result . Can you please give me a valid answer?
If you are using IP Telephony, you can use the "ip rtp header-compression" to compress the tcp/ip header.
Details: Does it really compress it? No, it just uses a smaller header with changes to initial header. Voice packets use RTP as a transport and as such have an IP/UDP/RTP header that is 40 bytes. Well a lot of that is redundant information and can be compressed down to 2 to 5 bytes. Condidering the voice package itself is small, you tremendously thin out the traffic. The lines to implement are fairly simple, see the below links for more information.
Compression of the voice sample - the payload of the packet - is accomplished using a codec, generally g.729. Compression of the ip/udp/rtp header is accomplished using cRTP. There are caveats to enabling cRTP. Enabling cRTP will depend upon the type of link, link speed, router platform & IOS, router load, etc.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
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