From: alsontra@hotmail.com
Date: Thu Mar 11 2004 - 14:48:43 GMT-3
ok. That's what I wanted to hear. Gatekeeper, RTP and H.323. It sometime
becomes very difficult to differentiate between the voice security and
routing and switching exams.
Thanks a million,
Alsontra
FYI: Here is a complete list of protocols involved in voice exchanges.
Another GS users graciously forwarded this to me.
http://www.cisco.com/en/US/tech/tk652/tk701/technologies_tech_note09186a00800f2853.shtml
-UDP/TCP Ports Used for VoIP-
Below are the UDP/TCP ports used for VoIP, H.323, SIP, and MGCP.
For H.323
a.. Unicast GK discovery to UDP port 1718.
b.. Multicast GK discovery to 224.0.1.41 UDP port 1718.
c.. RAS to UDP port 1719.
d.. H.225 (call signaling for hosts) to TCP port 1720.
e.. H.245 (capability exchange) to a negotiation in the range of TCP ports
11000 through 65535.
f.. RTP audio stream to UDP ports 16384 through 32767.
For SIP
a.. Either the UDP or TCP port for the signaling to port 5060.
b.. RTP audio stream to UDP port 16384 through 32767.
c.. User agent may register with a local server on the startup by sending
out a REGISTER request to IP address 224.0.1.175 (all SIP servers multicast
address sip.mcast.net).
For MGCP version 0.1
a.. MG and CA signaling to UDP port 2427.
b.. RTP audio stream to UDP port 16384 through 32767.
For MGCP version 1.0
a.. MG and CA signaling to MG through UDP port 2427 and CA through UDP
port 2727.
Note: This is because some CAs have the MG functionality built in them.
b.. RTP audio stream to UDP port 16384 through 32767.
Note: RTP port selection is MG specific. Depending on the number of voice
ports on the MG, the RTP port range is selected. It does not go as high as
32767 and the range can be as small as 256.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Scott Morris
Sent: Thursday, March 11, 2004 6:29 AM
To: 'David Hurtado'; ccielab@groupstudy.com
Subject: RE: VOICE Classification - Class-maps
MGCP uses UDP as the transport mechanism. And the default port used is
2427. I'm not sure where that range came from below. RFC 2705 is fairly
explicit about this.
Skinny (SCCP) uses TCP 2000, 2001 and 2002 depending on the device.
SIP uses a "default" of TCP and UDP 5060 but can actually move around
anywhere by your config.
Gatekeepers may also use port 1718 to do things.
H.245 (part of the H.323 operation) will use TCP within the 11000-11999
range.
However... While all of this is nice and good, I don't see any reason to
believe that you would be responsible for these on the R&S exam! Most of
the voice people I know don't remember them all, at least not from
memorization!
Concentrate on the "obvious" H.323 ones. TCP 1720 and UDP 16384-32767.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIS, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
David Hurtado
Sent: Thursday, March 11, 2004 6:07 AM
To: ccielab@groupstudy.com
Subject: Re: VOICE Classification - Class-maps
Which is the transport protocol for MGCP?
Thanks for the help
>From: <alsontra@hotmail.com>
>Reply-To: <alsontra@hotmail.com>
>To: <joe@martinsweb.org>, "'Yasser Abdullah '"
><yasser@alharbitelecom.com>, <ccielab@groupstudy.com>, "Ramasubramanian
>Sethuraman" <snrmanian@hotmail.com>
>Subject: Re: VOICE Classification - Class-maps
>Date: Thu, 11 Mar 2004 03:22:35 -0800
>
>Thanks for the responses. For the RS exam, I'm hoping this is it as
>far as voice port numbers go...
>
>Cisco H.323 uses TCP port 1720
>Cisco VoIP payload uses UDP ports 16835 - 32767 Cisco Gatekeeper uses
>TCP port 1719 SIP uses UDP port 5060 RTP can be identified by the RTP
>header MGCP port - 1025 through 65535 (not sure how important this is)
>SCCP (not sure)
>
>I can't seem to find all of these port numbers within the docCD, so
>guess memorization is probably the best method of recall. If anyone
>has any comments as to other relevant voice port numbers I would
>appreciate your comments.
>
>
>H.323 TCP 1720
>VoIP payload UDP 16835 - 32767
>Cisco Gatekeeper TCP 1719
>SIP UDP 5060
>RTP RTP header
>MGCP 1025 through 65535 (not sure how important
>this
>is)
>SCCP (not sure)
>
>
>Thanks,
>Alsontra
>
>
>
>----- Original Message -----
>From: "Joe Martin" <joe@martinsweb.org>
>To: "'Yasser Abdullah '" <yasser@alharbitelecom.com>;
><alsontra@hotmail.com>; <ccielab@groupstudy.com>
>Sent: Wednesday, March 10, 2004 10:29 PM
>Subject: RE: VOICE Classification - Class-maps
>
>
>Also, VoIP comes in protocols other than H.323. It could be SIP, MGCP
>or SCCP which all have different port for call control. Though all of
>them use the same UDP port range for RTP traffic.
>
>Joe
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Yasser Abdullah
>Sent: Wednesday, March 10, 2004 9:30 PM
>To: alsontra@hotmail.com; ccielab@groupstudy.com
>Subject: RE: VOICE Classification - Class-maps
>
>
>Also, if your voice gateways register with a gatekeeper, you'll need
>TCP port 1719.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>alsontra@hotmail.com
>Sent: Thursday, March 11, 2004 8:08 AM
>To: ccielab@groupstudy.com
>Subject: VOICE Classification - Class-maps
>
>Group,
>
>This question has been asked before, but there was no answer. Forgive
>my repetition...
>
>
>If you need to classify voice and all that goes with it (H323, etc),
>can you assume that ports 1720 and 16384 - 32767 will encompass voice
>traffic? In general, I'm finding that most voice traffic traverse these
>udp ports.
>
>For example:
>
>If you asked to classify and set DSCP values on all voip traffic, would
>something of this sort do the trick?
>
>ip access-list extended VOICE
> permit udp any any range 16384 32767
> permit udp any any eq 1720
>
> class-map match-all VoIP
> match access-group name VOICE
>
>
> policy-map QOS
> class VoIP
> set dscp cs5
> class class-default
> set dscp cs1
>
>int e0/0
>service-policy input QOS
>
>
>While this is certainly not all inclusive, it essentially cover most
>voip activities correct? Or do you have to try and use the question to
>find the appropriate port numbers?
>
>Thanks,
>Alsontra
>
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