[OpenSIPS-Users] How to overcome SIP ALG on Wi-Fi routers

[Patrick Wakano]

It seems you are facing packet fragmentation, and the second part of the
fragment isn't reaching opensips...
maybe your wifi router (if it is the only element between your endpoint and
opensips) is not correct handling this situation....
I would sugest a change to TCP as your next step for debugging this problem!

On Thu, May 5, 2016 at 5:23 PM, Nabeel <nabeelshikder at gmail.com> wrote:

> Yes, it is definitely listening on the non-standard port:
>
> # netstat -lnp | grep opensips
> udp        0      0 162.xxx.x.110:12341     0.0.0.0:*     1750/opensips
>
> In fact, it even seems to register correctly, but the INVITE does not get
> through.
>
> I have OpenSIPS set on debug level 4 but did not see anything in the log.
>
>
> On 5 May 2016 at 21:14, Tito Cumpen <tito at xsvoce.com> wrote:
>
>> Nabeel,
>>
>>
>> Did you verify that your opensips server is listening on this non
>> Standard port ?
>>
>> run
>>
>> netstat -lnp | grep opensips
>>
>> On Thu, May 5, 2016 at 4:12 PM, Nabeel <nabeelshikder at gmail.com> wrote:
>>
>>> Tito Campen, I took the trace on my OpenSIPS server, which is the
>>> receiving proxy. However, OpenSIPS did not add anything to the server's log
>>> itself.
>>>
>>> On 5 May 2016 at 21:08, Tito Cumpen <tito at xsvoce.com> wrote:
>>>
>>>> Nabel, You should should take a trace at the receiving proxy to verify
>>>> the traffic is even getting there. If there is no sdp received from the UAS
>>>> you would not see rtp traversing at all. Using non Standard points doesn't
>>>> assure you that messaging traffic will traverse.
>>>>
>>>> On Thu, May 5, 2016 at 3:54 PM, Tito Cumpen <tito at xsvoce.com> wrote:
>>>>
>>>>> Adding to Bogdan's point I am successfully using sip tls on port 443
>>>>> without any issues as of yet. It's bypassing some  isp enforced algs as
>>>>> well as those enforced by local routers. :-).
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Thu, May 5, 2016 at 3:35 PM, Nabeel <nabeelshikder at gmail.com>
>>>>> wrote:
>>>>>
>>>>>>
>>>>>> Please check the following SIP trace taken within a WiFi network. The
>>>>>> call fails to connect despite the INVITE request and using a non-standard
>>>>>> port. Could this be caused by SIP ALG, or some unopened RTP port on the
>>>>>> router?
>>>>>>
>>>>>> http://pastebin.com/raw/C4iymTbh
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>
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>>>>
>>>
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>>>
>>
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>>
>
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