SIM-based call routing
Route calls through mobile SIM cards. Use Jio, Airtel, Vi, or BSNL SIMs with unlimited or high-volume plans. Calls show a mobile number to the recipient.
Hardware · Call Centre
GSM gateway for Indian call centres.
A GSM gateway for Indian call centres that routes outbound and inbound calls via mobile SIM cards instead of expensive PSTN or PRI lines. Reduce STD and ISD calling costs by 40-60%. Supports 4 to 64 SIM slots. Integrates with Asterisk, FreeSWITCH, and cloud telephony platforms.
Who it is for
Who uses GSM gateways for call centres in India.
- Indian call centres and BPOs with 20+ agents
- Outbound telecalling teams making 500+ calls/day
- Real estate companies with high-volume telecalling
- Collection agencies making outbound payment reminder calls
- Any business with high STD/ISD telephone bills
The problem
Why Indian call centres use GSM gateways.
STD and ISD call costs are ₹1-3 per minute
Your call centre makes 2,000 outbound calls per day. At ₹1.5/minute average and 3 minutes per call, that is ₹9,000/day = ₹2.7 Lakhs/month in call charges alone.
PRI lines are expensive and inflexible
PRI lines cost ₹15,000-25,000/month for 30 channels. You are locked into a contract. Scaling up or down takes weeks of paperwork with the telco.
Caller ID shows landline — low pickup rate
Outbound calls from PRI lines show a landline number. Mobile users are 40% less likely to answer landline calls. Showing a local mobile number increases pickup rate.
Features
GSM gateway features.
Cost reduction of 40-60%
Mobile unlimited plans at ₹200-500/SIM/month vs ₹1-3/minute on PRI. For 2,000 calls/day, save ₹1.5-2 Lakhs per month.
Multi-SIM support (4-64 slots)
Choose gateway with 4, 8, 16, 32, or 64 SIM slots based on concurrent call volume. Each SIM handles one call at a time.
Asterisk and FreeSWITCH integration
SIP trunk interface connects to Asterisk, FreeSWITCH, 3CX, or any SIP-compatible PBX. Standard SIP protocol — no proprietary software.
Call routing and load balancing
Route calls based on destination (local SIM for local calls, low-cost SIM for STD). Load balance across SIMs to distribute usage and avoid operator flagging.
SIM rotation and anti-block
Automatic SIM rotation to prevent telecom operator blocking. Configurable call limits per SIM per day. IMEI management for compliance.
How it works
Save on calls in 1 week.
01
Assessment
We analyse your call volume, destinations, and current telephony setup. Recommend gateway size and SIM plan strategy.
02
Procurement and setup
GSM gateway hardware delivered. SIM cards inserted and registered. Connected to your PBX via SIP trunk.
03
Configuration
Call routing rules, SIM rotation, and load balancing configured. Tested with live calls. Integration with your CRM dialer.
04
Go live
Outbound and inbound calls routed via GSM gateway. Monitor cost savings on the dashboard. Fine-tune routing rules.
Pricing
GSM gateway pricing in India.
4-SIM Gateway
Small gateway for 5-10 agent teams.
- 4-SIM GSM gateway
- SIP trunk configuration
- Asterisk/FreeSWITCH integration
- SIM rotation
- Installation
- 6-month support
16-SIM Gateway
Medium gateway for 20-40 agent teams.
- Everything in 4-SIM
- 16 concurrent calls
- Advanced routing rules
- Load balancing
- Anti-block configuration
- 12-month support
32-64 SIM Gateway
Large gateway for 50+ agent call centres.
- Everything in 16-SIM
- 32-64 concurrent calls
- Redundant power supply
- SNMP monitoring
- Custom routing
- Dedicated support
- SLA guarantee
Comparison
GSM gateway vs PRI lines for call centres.
| Feature | Velozity | Typical alternatives |
|---|---|---|
| Cost per call | Near-zero with unlimited SIM plans | ₹1-3/minute on PRI |
| Monthly saving | ₹1-3 Lakhs for 2,000 calls/day | N/A |
| Caller ID | Local mobile number (higher pickup) | Landline number (low pickup) |
| Scalability | Add SIM slots — no telco paperwork | PRI upgrade takes weeks |
| Setup time | 3-5 days | 2-4 weeks for PRI |
| Integration | SIP — works with any PBX | PRI — limited to E1 cards |
Proof
Real results.
Saving lakhs per month for Indian call centres
Our GSM gateways route calls for real estate telecalling teams, collection agencies, and BPOs across India. Average client saves ₹1.5 Lakhs/month on call costs. Outbound pickup rate improved by 30% with mobile caller ID.
Read the case studyFAQ
GSM gateway for call centres India — FAQs.
Is using a GSM gateway legal in India?+
Yes, for business use with properly registered SIM cards. Ensure SIM cards are registered in the company name and comply with TRAI regulations. We guide you on compliance.
How many SIM slots do I need?+
One SIM handles one concurrent call. If you need 16 simultaneous outbound calls at peak, you need a 16-SIM gateway. We help size based on your call patterns.
Does it work with Asterisk?+
Yes. Standard SIP trunk interface. Works with Asterisk, FreeSWITCH, 3CX, Vicidial, GoAutoDial, and any SIP-compatible PBX or dialer.
Will operators block my SIMs?+
SIM rotation, call limits per SIM, and IMEI management significantly reduce blocking risk. We configure anti-blocking measures. If a SIM is blocked, simply replace it.
Can it handle inbound calls too?+
Yes. GSM gateways handle both inbound and outbound calls. Inbound calls on SIM numbers can be routed to your PBX and distributed to agents.
How much can we really save?+
Typical savings: 40-60% on outbound call costs. For a 20-agent team making 1,000 calls/day, savings are ₹1-2 Lakhs/month after gateway cost is recovered (typically in month 1-2).
A conversation is a good place to start
Cut your call costs by 60%.
Cut your call costs by 60%.
Get a GSM gateway quote.
Tell us what could work better. We'll help you find the intelligent way forward.
Call us: +91 80720 64524