Certified integration of BSNL (Bharat Sanchar Nigam Ltd) SIP trunks with Asterisk, FreePBX, and ViciDial. Call +91 75999-67999.
Are you planning to configure or troubleshoot a BSNL (Bharat Sanchar Nigam Ltd) SIP Trunk? Call Soft Corporation provides expert telecom integration services across India. We specialize in setting up and configuring BSNL business voice services with Asterisk, FreePBX, ViciDial, Issabel, and Grandstream UCM IP PBX systems.
Telecom carriers in India like BSNL deliver SIP trunks over dedicated physical fiber Leased Lines (ILL), MPLS, or FTTX connections. Proper configuration requires precise settings for WAN interfaces, IP-based or registration-based authentication, custom static routing, and dialing rules. Our certified engineers ensure 100% reliable connectivity with zero call drops, high call quality (G.711 alaw), and proper DID mapping for your business in Lucknow.
Here are the standard configuration parameters required for setting up BSNL SIP trunks on Asterisk-based PBX servers:
| Parameter | Value / Details |
|---|---|
| Authentication Type | Register String (e.g. +91XXXXXXXXXX@ims.mncXXX.mccXXX.3gppnetwork.org) |
| VLAN ID | VLAN 1839 (standard voice VLAN for BSNL) |
| SIP Port | 5060 (UDP) |
| Outbound Proxy | Provided per region (e.g. 10.x.x.x) |
| DTMF Mode | RFC2833 |
| Codecs Supported | G.711 alaw, G.729 |
1. Physical/VLAN WAN Setup: BSNL IMS SIP trunks are widely deployed over BSNL Bharat Fiber (FTTH) connections. The ONT/modem is usually configured to route VoIP traffic through a dedicated WAN profile (typically using VLAN 1839 or custom). Configuration requires registering with BSNL's regional IMS core using a domain format like `ims.mncXXX.mccXXX.3gppnetwork.org`. You must configure your PBX with the correct outbound proxy, registration string, and custom static routing rules.
2. Define OS Level Static Routes: You must route the SIP signaling IP and RTP voice IP ranges through the telecom gateway gateway IP rather than your public internet link. On Linux, run:
3. Outbound Dialplan: In FreePBX or ViciDial, define the dialing prefix and outbound Caller ID to match your allocated pilot number exactly. Contact our team at +91 75999-67999 for custom scripting or troubleshooting help.
These codes are region-specific and depend on your telecom circle. BSNL provides them with the service details. Example MNC/MCC domain: `ims.mnc050.mcc404.3gppnetwork.org`.
Yes, but you must ensure your ONT/router is bridging the voice VLAN to your PBX server, or that the ONT handles the routing and hands off a local IP to the PBX server. Custom static routes are always required on the server.
Yes, BSNL offers multi-channel SIP trunks suitable for office PBX systems and small call centers, though configuration is more strict compared to private operators.
We configure and troubleshoot SIP trunks for all major telecom service providers in India:
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