From: Hunt Lee (huntl@webcentral.com.au)
Date: Tue Mar 11 2003 - 20:40:23 GMT-3
So what's the use of "ip tcp header-compression iphc-format"?
Is it just for compressing tcp "data" traffic?
-----Original Message-----
From: Ouellette, Tim [mailto:tim.ouellette@eds.com]
Sent: Wednesday, 12 March 2003 12:19 AM
To: 'Hunt Lee'; ccielab@groupstudy.com
Subject: RE: Compression mystery
Voice traffic is a UDP data stream in the range of 16384 - 32676 even(this
is RTP)
but there is RTCP (control) that runs in the same range (odd)
As far as that "IPHC-format" goes, I did a search on cisco and it appears
when you type in "ip rtp header-compress iphc-format" that i'll
automatically add the "ip tcp header-compress iphc-format"...
The only TCP I can think of that would be flowing would be SSCP (skinny)
keepalives between your CCM and your IP phone?
Tim
-----Original Message-----
From: Hunt Lee [mailto:ciscoforme3@yahoo.com.au]
Sent: Tuesday, March 11, 2003 6:11 AM
To: ccielab@groupstudy.com
Subject: Compression mystery
Hi Group,
I saw the following config from a VoIP config...
Would you know what is the differnece between "ip tcp header-compression
iphc-format" & "ip rtp header-compression iphc-format"?
Is it the first one is used to compress TCP "data" traffic, whereas the
latter one
is used to compress "RTP traffic" e.g. voice?
interface Multilink1
ip unnumbered Ethernet1/0
no ip directed-broadcast
ip tcp header-compression iphc-format <--- This?
no ip mroute-cache
fair-queue 64 16 0
no cdp enable
ppp multilink
ppp multilink fragment-delay 10
ppp multilink interleave
multilink-group 1
ip rtp header-compression iphc-format <--- & this?
ip rtp priority 16384 16383 48
And what does iphc-format do?
Any help / ideas would be greatly appreciated.
Regards,
Hunt
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