[Spce-user] Fwd: Re: Blacklist t.38 fax codec

[Leopoldo Iglesia]

When the proxy answer the 488, next packet is other invite.. and no more.

The problem is that the SDP packet comes withh all codecs like this



El 20/06/2014 14:09, Daniel Grotti escribió:
> Hi,
> If you want to discard all INVITEs with T38, you can try to add 
> something like that in your 
> /etc/ngcp-config/templates/etc/kamailio/proxy/proxy.cfg.customtt.tt2:
>
>
> if(is_method("INVITE") && search_body("udptl"))
> {
>    sl_send_reply("488", "Not Acceptable Here");
>    exit;
> }
>
> before to send the invite to ROUTE_INVITE.
> Then run "ngcpcfg apply".
>
> So, each INVITE/REINVITE with udpl in their body will be discarded.
>
>
> Daniel
>
>
>
>
> On 06/20/2014 01:35 PM, Daniel Grotti wrote:
>> I have nothing ready to give you right now.
>> Basically on kamailio proxy you should match a Re-invite (using the 
>> "has_totag") and check if SDP contains t38 headers/codec (just have a 
>> look how the T38 reinvite looks like).
>> So, if you receive a re-invite with T38 headers into SDP, just send 
>> back a 488 reply.
>>
>> Daniel
>>
>>
>>
>>
>>
>> On 06/20/2014 01:28 PM, Leopoldo Iglesia wrote:
>>> Fine, how can I do this hack? cause endpoints is impossible to mod 
>>> config, so they are rented and provisioned by an ftth operator.
>>>
>>> El 20/06/2014 13:23, Daniel Grotti escribió:
>>>> Hi,
>>>> I think you need to avoid to forward the T38 Re-INVITE, so you 
>>>> should hack your SPCE in order to reply to the T38 re-invite with a 
>>>> "488 Not acceptable here", for example.
>>>> So the sender SHOULD fallback to G711.
>>>> Anyway, the best solution if you have endpoint with t38 enabled but 
>>>> they don't work well, is to disable t38.
>>>>
>>>>
>>>> Daniel
>>>>
>>>>
>>>>
>>>> On 06/20/2014 01:15 PM, Leopoldo Iglesia wrote:
>>>>>
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>>>>>
>>>>> > But both endpoints support it, that is the problem and the only 
>>>>> > scenario when it fails, so i want SPCE not to send Fax 
>>>>> negotiation to > endpoint,.
>>>>>
>>>>>
>>>>>
>>>>>  El 20/06/2014 12:12, Daniel Grotti escribió: >> Hi, >> that's 
>>>>> strange, if one of the endpoints try to switch to t38 and the >> 
>>>>> other endpoint doesn't support it, they should fallback to G711. 
>>>>> >> >> Daniel >> >> >> >> >> >> >> On 06/20/2014 01:33 AM, Leopoldo 
>>>>> Iglesia wrote: >>> How can I, blacklist t.38 to avoid endpoints to 
>>>>> try t38 negotiation? >>> >>> When i call from ericcson ont to fax 
>>>>> capable endpoint, it try to >>> connect t38 fax and There is no 
>>>>> voice. >>> >>> Thanks >>> >>> Leopoldo iglesia >>> >>> 
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>>>>>
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>>>>
>>>>
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