Back to Case studyCloud Service Provider Leverages SIP Trunk to Gain Cost Optimum and Seamless Voice Solution
ShareIntroduction
For our customer, every call is important, and it was imperative for them to find a way of managing all their calls efficiently. They required a solution to handle at least 400 concurrent calls while avoiding expensive setups. The setup also had to ensure provisions for redundancy for uninterrupted calling.
For ensuring cost-optimum solution with the required Service Level Agreement (SLA), the TTBS team identified the maintenance of a total of 800 channels, with SIP Trunk 1 hosting Active 400 channels and SIP Trunk 2 hosting the other Passive 400 channels.
Business Challenges
Keeping cost-effectiveness in mind, TTBS delivered SIP Trunk over Ethernet with SDH ring architecture.
From the Last mile, SIP Trunk was terminated over the SBC.
The 4,000 DIDs were split equally between the two trunks.
To achieve 100% concurrency, bandwidth for both trunks supported the aggregate of SIP 1 and SIP
TTBS SIP Trunk is a P2P circuit with /30 IP address assigned by TATA. The same IP address was assigned to the customer PBX’s NIC interface.
The codec on both trunks was configured to comply with the G.711-A law.
The Dual-Tone-MultiFrequency was set at RFC 2833.
“P-Preferred-Identity” header was included in all SIP INVITEs for correct DID CLIP display on the outgoing calls.
DID number sending (DNIS) on SIP INVITE “To” header on the incoming calls .
TTBS ensured the keepalive mechanism through SIP OPTIONS. The expected response was SIP 400 Ok from the CPE device.
The following parameters were provided by TTBS: Customer IP (configured at the SBC’s NIC port) Gateway IP, SIP Server, IP Subnet Mask, Username, Password and DID Range .
TTBS Challenge
- Cost savings as there was no investment on multiple PRI cards
- Redundancy ensured for uninterrupted incoming calls
- High uptime and no single point of failure
Benefits
- SIP Trunk: Cost savings as there was no investment on multiple PRI cards
- Redundancy ensured for uninterrupted incoming calls
- High uptime and no single point of failure
