Staff Augmentation for Telecom Companies

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The Telecom Talent Shortage Problem

6 Telecom Use Cases for Staff Augmentation

Augment vs Outsource vs Full-Time Hire

Choosing the right engagement model depends on your timeline, budget, and long-term needs. Here's how the three compare for telecom engineering:

Telecom-Specific Challenges & How We Solve Them

Example: OpenSIPS MVNO Routing Script

Here's a simplified but realistic OpenSIPS routing script showing how an MVNO routes SIP traffic between MNO (Mobile Network Operator) and subscriber networks:

# OpenSIPS MVNO Routing Logic
# Route subscriber calls to home SIP trunk (MNO)
# Inbound calls from MNO to subscriber via HSS lookup

route {
    # Initial request sanity checks
    if (!mf_process_maxfwd_header("10")) {
        send_reply("483", "Too Many Hops");
        exit;
    }

    # Normalize URI (add country code if missing)
    if ($rU =~ "^[5-9][0-9]{9}$") {
        $rU = "91" + $rU;  # India E.164 format
    }

    # Log all calls (for CDR generation)
    xlog("L_INFO", "Call from $fU to $rU | Source IP: $si");

    # Check if destination is local subscriber (HSS lookup)
    if (!lookup("location")) {
        # Subscriber offline or not registered
        if ($rU =~ "^[0-9]+$") {
            # Route to MNO SIP trunk (Jio, Airtel, etc.)
            route(to_mno_trunk);
        } else {
            send_reply("404", "User Not Found");
            exit;
        }
    }

    # Forward to registered subscriber (local routing)
    forward();
}

# Route to MNO upstream SIP trunk
route[to_mno_trunk] {
    xlog("L_INFO", "Routing $rU to MNO trunk at $var(mno_sip_gw)");

    # Set SIP headers for MNO interconnect
    append_hf("P-Charge-Info: <sip:$fU@$fd>
");
    append_hf("P-Asserted-Identity: <sip:$fU@$fd>
");

    # Route to MNO gateway with failover
    if ($var(mno_sip_gw) == "jio") {
        if (!t_relay("udp:jio-sip-gw.in:5060")) {
            xlog("L_ERR", "Jio trunk FAILED; failover to Airtel");
            $var(mno_sip_gw) = "airtel";
            t_relay("udp:airtel-sip-gw.in:5060");
        }
    }

    if_reply_route {
        xlog("L_INFO", "Response $rs from MNO: $rr");
    }
}

# Inbound routing (MNO to subscriber)
request_route[from_mno] {
    # Verify source IP is MNO
    if ($si != "jio-sip-gw.in" && $si != "airtel-sip-gw.in") {
        xlog("L_WARN", "Unauthorized MNO source: $si");
        send_reply("403", "Forbidden");
        exit;
    }

    # Lookup subscriber in HSS
    if (!lookup("location")) {
        send_reply("480", "Temporarily Unavailable");
        exit;
    }

    # Apply VAS (Value Added Services)
    route(check_voicemail);
    route(apply_callbar);

    # Forward to subscriber endpoint
    if (!t_relay()) {
        t_reply("500", "Call Failed");
    }
}

# VoiceMail Check (IVR logic)
route[check_voicemail] {
    if ($rU =~ "^\*123$") {
        $ru = "sip:[email protected]";
        route(to_voicemail);
    }
}

# Apply call barring rules (from HLR)
route[apply_callbar] {
    # Check if roaming subscriber
    if ($var(is_roaming) == 1) {
        # Apply roaming limits (max call duration, block premium numbers)
        xlog("L_INFO", "Roaming call limited to 20 min");
    }
}

route[to_voicemail] {
    t_relay();
}

onreply_route {
    xlog("L_INFO", "Response $T_reply_code from $T_reply_source");

    # Record ACM (Answer to Connect Message) for billing
    if ($rs == "180") {
        $var(acm_timestamp) = $Ts;
    }
}

failure_route[mno_failover] {
    xlog("L_WARN", "MNO trunk failure; attempting failover");
    # Implement redundancy logic
}

Telecom Verticals That Use Staff Augmentation

The CelloIP Telecom Augmentation Process

Frequently Asked Questions