From: Tarun Pahuja (pahujat@gmail.com)
Date: Sat Nov 24 2007 - 16:58:20 ART
Wilfreb,
Voice packets travels in rtp packets which are then encapsulated
into UDP. The port numbers used in Cisco's implementation of voip are from
UDP 16384 - 32767.
VoIP calls can be established using H.323, SIP, MGCP or Skinny (Proprietary
Protocol used by Cisco Call Manager). The port numbers used for signalling
are listed below:
H.323/H.225 = TCP 1720
H.323/H.245 = TCP 11xxx (Standard Connect)
H.323/H.245 = TCP 1720 (Fast Connect)
H.323/H.225 RAS = TCP 1719
Skinny = TCP 2000-2002 (CM Encore)
ICCP = TCP 8001-8002 (CM Encore)
MGCP = UDP 2427, TCP 2428 (CM Encore)
SIP= UDP 5060, TCP 5060 (configurable)
You can use these values to prioritize media and or signalling.
HTH,
Tarun
On 11/18/07, wilfred d'souza <wilfred_thegr8@yahoo.co.in> wrote:
>
> Hello,
>
> Can smeone please let me know how can we use ip rtp to diffrentiate
> between Signalling and media... Also I need to mark the traffic with proper
> bandwidth..
>
> How can i do that?
>
> Appreciate your response
>
> Thanks,
> Wilfred
>
> Avner Izhar <aizhar@ccbootcamp.com> wrote: Hi,
>
> Iv you enable the 'ip udp checksum' command under the voip dial-peer, rtp
> will contain crc info and the cRTP will have to send this field as well
> (since it changes from packet to packet).
>
> cRTP on it's own has to sense and adjust to the rtp stream, as per rfc
> 2508, if the original packet has crc values other then 0 (zero), then the
> crc has to be copied in to the compressed header.
>
> HTH,
>
> -------------------------------------------
> thanks,
> Avner Izhar
> CCIE#15999 (Voice), CCVP, CCSI# 31623
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>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> CCIE
> Sent: Sunday, November 18, 2007 15:42
> To: ccielab@groupstudy.com
> Subject: ip rtp header-compression
> Importance: Low
>
> pWhenever I try cRTP, throught the command
>
> ip rtp header-compression
>
> I can't find the option to preserve the UDP header checksum or not?
>
> Could anyone clarify if this by default would preserve the UDP header
> checksum or not, and how I could manipulate preserving the UDP.
>
> Regards,
>
> Amin
>
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