Set up outgoing calls through Binotel from Azerbaijan using a Ukrainian IP

Software & Server Configuration, System & Network Administration — incorrectly specified categories?

16 USD

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There is an employee who is physically located in Baku (Azerbaijan), but needs to work with Ukrainian telephony and make calls through Binotel with a Ukrainian IP address (preferably Kyiv).

Current situation:

Incoming calls through Binotel are received without problems.
Outgoing calls do not work correctly:
the call connects;
the interlocutor cannot hear the employee;
the employee cannot hear the interlocutor.
A software SIP phone (MicroSIP) is used.
We tried changing the IP through a proxy — the problem was not resolved.
Proton VPN (paid plan) is installed.
The VPN successfully connects to servers in other countries, but the connection to Ukrainian servers of Proton VPN cannot be established.
It is necessary to find the cause of the problem and ensure stable operation of outgoing calls.

What is required from the performer:

Conduct a network, SIP, and telephony settings diagnosis.
Determine the cause of the absence of sound during outgoing calls.
Check NAT, RTP, codecs, SIP ALG, VPN, and traffic routing settings.
If necessary, select and configure a working solution to obtain a Ukrainian IP address.
Set up the system in such a way that:
outgoing calls work stably;
there is two-way audio;
the employee can work from Azerbaijan through Ukrainian telephony.

Work result:
A fully functional scheme for making and receiving calls through Binotel from Azerbaijan with correct voice transmission in both directions.

Additional information:
Access is possible via AnyDesk. Experience with SIP telephony, Binotel, MicroSIP, VPN, and VoIP network diagnostics is desirable.

Proposals 3 Discussions 6

Roman Pavlovsky

23 1

Budget: 1500 UAH Deadline: 14 days

Good day, Olga!
For your task with Binotel, I would rather suspect the problem not to be with the VPN, but one of the following reasons:

- Proton VPN cannot connect specifically to Ukrainian servers.
- RTP traffic is bypassing the VPN (split tunneling).
- The VPN is cutting or incorrectly routing UDP traffic.
- The provider or router is interfering with SIP/RTP (SIP ALG).

To quickly understand where the problem lies, you can conduct a simple test:
- Find out the external IP without the VPN.
- Connect the VPN.
- Check the IP on a site like whatismyip.
- During the call, capture a Wireshark dump and see if RTP packets are going to the Binotel addresses.

From experience, in 80-90% of similar cases, the culprits are:
- SIP ALG;
- incorrect NAT on the router itself (SIP ALG on the router);
- RTP through the VPN is not taking the correct route;
- the VPN does not allow UDP traffic completely.

If you need a Ukrainian IP specifically for telephony, the most reliable solution is to rent a VPS in Ukraine from providers like Hostpro, Cityhost, or DeltaHost and set up your own WireGuard server. This is usually more stable for SIP telephony than using public VPN services, but it also has its own features and limitations.

If you have any questions, feel free to write, and we can discuss.

Ivan K.

4 0

Budget: 12000 UAH Deadline: 4 days

Good afternoon. I can perform a complete diagnosis and eliminate the cause. Feel free to contact me.

Artem P. 5 June

Ооо, запуск нового call центру під'їхав.

Olga Klovskaya

5 June

На жаль, ні, не новий і не call-центр. IP-телефонія використовується не лише цими організаціями. Швидка медична допомога теж використовує IP-телефонію.