From: Alexander Arsenyev (GU/ETL) (alexander.arsenyev@ericsson.com)
Date: Wed Jan 05 2005 - 08:18:29 GMT-3
Hello,
Why not have a look into "Assigned Numbers" database http://www.iana.org/assignments/port-numbers
and find out what ports are assigned to H323 signalling? Presumably, Alcatel phones should
be standards-compliant otherwise they would never work with other vendor's CM :-)
Simple search brought me
h323hostcallsc 1300/tcp H323 Host Call Secure
h323hostcallsc 1300/udp H323 Host Call Secure
h323gatedisc 1718/tcp h323gatedisc
h323gatedisc 1718/udp h323gatedisc
h323gatestat 1719/tcp h323gatestat
h323gatestat 1719/udp h323gatestat
h323hostcall 1720/tcp h323hostcall
h323hostcall 1720/udp h323hostcall
h323callsigalt 11720/tcp h323 Call Signal Alternate
h323callsigalt 11720/udp h323 Call Signal Alternate
Out of these, I think that IP phones use 1720/tcp towards CM for signalling.
Alternative reference is ITU Rec H.225.0 Appendix IV.4.1.2 where it says that
"Endpoint TCPCall Signalling Port 1720". It also explicitly says that 1718|1719/udp is
for gateways/gatekeepers. So You are left with 1718|1719/tcp and possibly 11720/udp
(You are already capturing 11720/tcp with "TCP gt 3000" statement in Your MQC).
Now it would be trivial to change Your MQC to try and capture these remaining ports.
If still unsuccessful I would also push a hub between Alcatel phone and a switch then plug
there a laptop with Ethereal to sniff signalling.
The 1-2 minute signalling dropout for Alcatel phones could also be explained by how TCP/IP stack in
Alcatel phones adapts to packet loss/excessive delay which occurs when WAN backup kicks in.
I remember seeing very similar symptoms when testing some other vendor equipment and doing link breaks
with FTP file transfer ongoing.
The results were really depending on how fast backup link kicks in and sometimes FTP transfer
survives sometimes not reporting "550: Broken pipe".
HTH,
Cheers
Alex
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
Sent: 05 January 2005 10:40
To: Richard.Dumoulin@vanco.fr; ccielab@groupstudy.com
Subject: RE: RE : Alcatel 4035 IP Phones
True . I was meaning H323 Gateway Signaling earlier when I said TCP 1720.
An the reason why I was putting across my original question regarding
Alcatel IP 4035 phones was , we do have an issue with one of my tail sites
where I got 40 odd Cisco 7960s in one department and 20 odd Alcatel 4035s (
we just want to try different vendor products to see the relevant cost
benefit analysis) in another department. And we do have WAN redundancy
between this tail site to the HUB where CM is located.
Now the problem we are having is , when ever the primary Frame goes down ,
dialer watch kicks in and triggers the back up onramp30. And during that
process all Cisco IP phones will happily work till the IP routing resumes in
via ISDN backup. Meaning their signaling is intact.
But our Alcatel IP 4035 IP phones do have problem and when ever our primary
Frame goes down , the phones drops out for a minute or 2 before come online
again. And I do suspect that for some reason my current MQC signaling ACL
may NOT be protecting the Alcatel's IP phones. And simple reason could be
these guys may be using different set of Signaling ports ( I am currently
matching TCP 1720 , TCP 2000 and TCP gt 3000) all together.
So I am not 100% on whether these signaling ports are "Vendor specific" or
they universally same across all Voice players such as Cisco , Avaya and
Alcatel..et
So I appreciate if any one confirm this :-)
Cheers
- David.
>From: Richard Dumoulin <Richard.Dumoulin@vanco.fr>
>To: David Duncon <david_ccie@hotmail.com>, ccielab@groupstudy.com
>Subject: RE : Alcatel 4035 IP Phones
>Date: Wed, 5 Jan 2005 08:19:47 -0000
>
>TCP port 1720 is used for h323 I think. RTCP uses the odd ports in the same
>range as RTP,
>
>-- Richard
>
>-----Message d'origine-----
>De : David Duncon [mailto:david_ccie@hotmail.com]
>Envoyi : Wednesday, January 05, 2005 4:15 AM
>@ : ccielab@groupstudy.com
>Objet : Alcatel 4035 IP Phones
>
>Hi Group,
>
>
>I was wondering what UDP port range (for RTP) and TCP port range (for RTCP)
>does Alcatel 4035 IP phones use ?
>
>I am not sure on whether or not these ports are "vendor" specific ?
>
>And like Cisco IP phones use udp 16384 to 32768 (for RTP) and tcp 1720 (for
>RTCP) , I would like to know ports the Alcatel 4035 IP phones use ?
>
>
>Cheers
>
>- David
>
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