[Serusers] Calls from UAs behind NAT getting a 503 error...

[Kyriakos]

Sorry Klaus, I pressed reply instead of reply to all so the mailist  was not 
CCed,   :-)

I used the example configs v5  from Onsip.org and it didnt include an ACK 
handler.
I added the extra code and no more warnings now.

Also another thing i had to do when i was setting up the example config file 
for NAT and Media proxy was to add a check for NATed caller before the part
of the below code in Invite handler:

 if (!proxy_authorize("","subscriber")) {
 proxy_challenge("","1");
 break;
 } else if (!check_from()) {
 log (1,"route[3]: 403 error \n");
 sl_send_reply("403", "Use From=ID");
 break;
 };

Without the check and the fixed contact , no UA behind NAT could make a call 
except from the UA that took port 5060 on  NAT.


I also found that in my config file when a caller was behind nat and was 
trying to make a pstn call , i called use_media_proxy twice.
When i fixed that , the calls would go through ok and not get a 503 
response.
Can someone explain what exactly happened when i called the use_media_proxy 
twice and the calls were getting rejected?

Many thanks,
Kyriakos


----- Original Message ----- 
From: "Klaus Darilion" <klaus.mailinglists at pernau.at>
To: "Kyriakos" <tank30 at hotmail.com>; "ser users" <serusers at lists.iptel.org>
Sent: Wednesday, November 09, 2005 4:48 PM
Subject: Re: [Serusers] Calls from UAs behind NAT getting a 503 error...


> Kyriakos wrote:
>> So Klaus, basically what i need is an extra handler for ACK?
>>
>> route[6] {
>>
>> # ------------------------------------------------------------------------
>> # ACK Handler
>> # ------------------------------------------------------------------------
>> if (method=="ACK") {
>> t_relay();
>> return;
>> };
>
> That should work
>
>> Does this affect the call flow? I mean Ive read that responses to ACK 
>> requests are not that important.
>
> per standard: there is NEVER a response to an ACK
>
>> Im a newbie in SER and sip so please bare with me.
>> :-)
>
> please always cc: to the list.
>
> regards
> klaus
>
>> By the way thanks for the reply.
>>
>> Kyriakos
>>
>>
>>
>
>