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

[Greger V. Teigre]

FYI:
http://www.onsip.org/modules/newbb/viewtopic.php?topic_id=60&forum=2

----- Original Message ----- 
From: "Kyriakos" <tank30 at hotmail.com>
To: "ser users" <serusers at lists.iptel.org>
Sent: Thursday, November 10, 2005 9:34 AM
Subject: Re: [Serusers] Calls from UAs behind NAT getting a 503 error...


> 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
>>>
>>>
>>>
>>
>>
>
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