08-06-2007 01:45 PM - edited 03-14-2019 10:57 PM
Hi,
Is it possible to compress th rtp header on a VPN.
I use fastEthernet to connect with the IDU.I can't use the rtp-header compression on the FastEthernet interface.
In other case, how can I activate IP RTP Header-compression, if I use FastEthernet interface.
Thanks
08-06-2007 01:53 PM
cRTP is supported only on serial interfaces. So you cannot enable it on VPN or fastethernet.
Hope this helps, please rate post if it does!
08-07-2007 05:18 AM
I have only 512Kbps with my ISP.
So the max number of call that can be supported is 6, because of the FastEhternet.I use VPN (site-to-site) for the call tranfert to my remote CME.
1 - Is there any idea to improve the number of the call?
2 - How can I reduce the bandwitdh consumption, per call? Now it is 60Kbps per call. I wanna reduce it.
I already use VPN (group 2 for the isakmp policy) and autoQoS Voip.
Thanks :-)
08-07-2007 05:29 AM
Hi,
Are you using g.711 ? That would be 87 kbps per call, not 60.
You can configure g.729 under the ephones, but you need to do that for all the ephones you are using site-site.
08-07-2007 05:51 AM
Hi,
No I'm using g729r for the two dial-peer.
The calculation is with thi site : http://tools.cisco.com/Support/VBC/do/CodecCalc2.do
I'm using tunnel interface for the VPN.
Thks,
08-07-2007 05:57 AM
Hi,
if g.729 is successfully negotiate (check on the phones pressing ? twice and look at info), your only option to reduce bandwidth would be to pass voice without VPN, directly on a internet interface with public address.
08-07-2007 06:53 AM
Hi,
If I don't use VPN, there is no safety.
And how about fragmentation?
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