[Freeswitch-users] SIP handset connection issues

[Ciprian Dosoftei]

Sam --

I would debug this by validating the premise that your FreeSWITCH node is
indeed available through deploying a SIP client on your workstation/laptop
using the same user credentials as on your phone. If everything checks out
yet Zoiper still fails, it's likely an issue with its networking. For
example, perhaps on the days when it works fine the phone might be
connected on your local wireless network (and it permits SIP traffic) and
when it doesn't, it may be connected through your data plan which might
block SIP traffic -- it's a speculation but not an uncommon scenario. If
that's the case, the easy fix is to change your SIP port to something
nonstandard, and if possible, enable TLS encryption.

On Mon, 9 Dec 2019 at 14:32, Sam van Herwaarden <
svanherwaarden at precisionag.org> wrote:

> Hi,
>
> I often have issues where my SIP handset can't seem to connect to my
> FreeSWITCH server. I'm using Zoiper on iOS and the default freeswitch
> installation (freeswitch-meta-all) on Debian Buster. The configuration is
> mostly vanilla - I disabled mod_signalwire, enabled mod_flite and
> mod_erlang_event, changed the default password and set up an extension that
> uses mod_erlang_event but that's all.
>
> On the server ports 5060, 5070 and 5080 are open on TCP+UDP, ports 3478
> and 3479 are open on UDP, and the port range 16384-32768 is also open on
> UDP. The server runs on a node on DigitalOcean.
>
> The issue I'm encountering is that sometimes my handset registers just
> fine, but other times I get timeout/unreachable errors. Nothing seems to
> change about the configuration though - I don't restart the server or
> anything like that. Also, I do see connection attempts on the server from
> unknown IPs (I'm assuming these are malicious bots trying to get into the
> system) - this suggests to me that the server is reachable. The system can
> be unreachable (to me) for days, but then be reachable for days. I have not
> been able to recognize a pattern.
>
> Does anyone have any suggestions what could be going on? Can it be
> something with my home networking setup? I would be happy to try a
> different SIP app if anyone has recommendations, it might be easier to
> debug this problem if I can get more verbose error messages than what
> Zoiper provides me with.
>
> Kind regards,
> Sam
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-- 
Best Regards,
Ciprian Dosoftei

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