Topic: H323 - CallServe

[Ian Wells]

Yesterday I installed e-smith as my gateway/firewall/server.

Web & email access worked at once, but I now have a problem with H323.

Specifically I cannot start a call with Callserve
(http://www.callserve.com/EN/FAQ/Index.asp?history=46)

I had it working earlier when ZoneAlarm (on Win98) was my Firewall by opening the required ports for the ip-addresses that callserve uses.

I don't know if this is a NAT problem, or a Firewall problem.

The callserve web-site says:

    UDP ports 1717, 1718, 1719 (for both in and out bound traffic)
    TCP port 1720 (for both in and out bound traffic)
    All TCP and UDP ports between 16384 and 32767


If I cannot sort this out then I will have to return to Win98 & ZA, as all
our international calls are made via callserve.

any comments?

[Ed Form]

Callserve and the various other telephone over internet providers don't work through NAT.

Ed Form

[Ian Wells]

thank you for the comment,

I thought that the ip_masq_h323 module took care of the NAT issue.

On win98 it could also cope with the NAT issue, I ran ICS and it understood H323. I am starting to think that it is more of a firewall issue than NAT, but don't have enough understanding of either e-smith or ipchains.

Ian

[Ed Form]

Ian Wells wrote:
>
> thank you for the comment,
>
> I thought that the ip_masq_h323 module took care of the NAT
> issue.
>
> On win98 it could also cope with the NAT issue, I ran ICS and
> it understood H323. I am starting to think that it is more of
> a firewall issue than NAT, but don't have enough
> understanding of either e-smith or ipchains.

You may be right here, but I looked into this when I tried to use the .NET telephone service provided as an accessory in Microsoft Messenger and it failed with a message that NAT is in the way. Nothing else would work either.

My system has two network cards and a dialup modem linked to the second network card by an EDIMAX Internet server. This effectively means there are two levels of NAT running in my case. Perhaps that is the problem.

Ed Form

[Charlie Brady]

Ian Wells wrote:

> I thought that the ip_masq_h323 module took care of the NAT
> issue.

I would think that it would, as long as you initiate the H323 connection.

You might like to try version 5.1 (not yet available, but beta4 is) - it includes an updated H323 NAT module.

Regards

Charlie

[sander]

Does 5.1 allow outbound voice transfers?

or it updated it for using it in local network?

sander