Help Needed: Configuring Netlink Modem for VoIP in Bridge Mode

[vaghese]

Hello everyone,

Is there anyone here offering professional services? I need assistance setting up BSNL VoIP on my Grandstream UCM device. Specifically, I am looking for help with configuring the necessary settings in my Netlink modem.

Any guidance or support would be greatly appreciated. Thank you!

 

[!!..PD..!!]

Idk about the Grandstream UCM device.
For Netlink VOIP you have to get:
1) Phone number along with pattern (+91/91/0)
2) Password
3) VLAN id
4) SIP address

Ask LCO or BSNL about these 4 and then respond here.
Also, refer to this link once: How To Configure BSNL FTTH Voice On Soft SIP Client On Mobile / Laptop? Enable WiFi Calling Facility For BSNL FTTH Voice | KeralaTelecom.Info

 

[vaghese]

Hi @!!..PD..!! ,
Thank you for your response! Could you please send a message to "var ghe sevv [ ] g m a i lcom" (please remove all spaces and add a dot at the relevant place)
Looking forward to your message!

 

[tr1k0N4]

Brdr, watch this video:

Source

Although it's for Airtel Xstream, the steps should be pretty similar for BSNL too!
You basically need to enable Internet in your Voice WAN profile and then create a static route.

 

[vaghese]

Hello dears,
My current setup is as shown in the attached image.
I have all the required details from BSNL to configure VoIP.

When I set up the VoIP interface in route mode on the Netlink modem, I can successfully ping both the gateway (10.113.96.1) and the SIP server (10.181.166.2) from the Netlink modem.

However, when I configure the modem in bridge mode for VoIP, I can ping the gateway but not the SIP server from the Mikrotik device.

I suspect there might be an issue with NAT configuration or something else required for a proper setup.

Any suggestions or guidance would be greatly appreciated.

 

[tr1k0N4]

What exactly is your objective when you change the VoIP profile to bridge mode, if route mode on your Netlink is doing the job just fine?

 

[hariselio]

@vaghese if you are not able ping SIP server, but gateway means, static route is missing.

 

[tr1k0N4]

Yep, that seems like the issue here

PS my last comment can be ignored safely.

 

[vaghese]

Hi @hariselio,

Thank you for the hint! I added another route with the gateway set to 10.138.128.1, and I’m now able to register successfully. However, I’m still unable to make or receive calls.

It seems the issue might now be related to the NAT configuration (currently set to normal masquerade).

Looking forward to suggestions!

 

[hariselio]

I also faced configuration issues in my Airtel VOIP behind Mikrotik router. Mainly NAT issues especially for RTP packets, i could receive or make calls, but no voice is transferred.

The way i solved or worked around is, created separate Bridge in mikrotik and added VOIP VLAN interface and the ethernet interface where i connected the VOIP phone. Finally configured the static VOIP client IP provided by airtel in the VOIP phone itself. In this way there was no NAT involved.

@vaghese Hopefully you can find the solution for NAT configuration in mikrotik and update here.