1) IP Telephony :
PAWAN has centralized network architecture. It consists of call manager at the central site, IP telephone users spread across the network. The IP telephones are connected to the Soft Switch either using LAN if the user is located in the LAN or WAN if the user is located remotely. The WAN network has been built for data traffic and is being used to connect the IP phones located in the remote sites. The same IP WAN also carries call control signaling between the central site and the remote sites. Centralized system also supports termination of PSTN lines, call processing of both PSTN and VoIP calls can be done using call manger. Cisco Call Manager has been implemented for managing IP Telephony. The centralized call manager controls the entire IP telephony network. It performs the major tasks such as Call Processing, Controlling, Switching, etc. In this model, the remote sites rely on the centralized call manager to handle their call processing. Routers that reside at the WAN edges require quality of service (QoS) mechanisms, such as priority queuing and traffic shaping, to protect the voice traffic from the bursty data traffic across the WAN. The primary advantage of this model is centralized call processing that reduces the equipment required at the remote sites and facilitates to have Unified Dial plan across the network. The architecture is centralized in nature. All the call processing engine & Soft Switch is located at the SNC, while IP telephone users are spread across the LAN and WAN. Call server/ call manager is used as IP PBX and performs the Call processing and Call control Functionality. IP Phone is being used for the Office communication.
2) Video Conferencing:
The video conferencing services are managed from SNC. A central Video Conferencing MCU is also located at SNC catering to the entire PAWAN Video Conferencing traffic forming a Hub and Spoke topology. Desktop based VC solution has been implemented which has the facility to setup point to point/multipoint VC sessions
Other end point equipment (projector, end point client system etc.) has also been enabled for video connectivity.
3) Internet Distribution
The PAWAN acts a single point Internet gateway for all the network nodes/offices of Government of Punjab connected with PAWAN. Single point of Internet connectivity (Internet Gateway at SNC) is envisaged to achieve centralized management and access control with high level of security and performance. The Secure Web gateway offersa dedicated appliance based solution designed for secure proxy and active content caching services.
4) Mail Server
Microsoft exchange is existing mail server Solution deployed on redundant rack servers with 1 TB of SAN storage. Presently, around 10500 Mail id’s has been created for various Punjab government officials. It has been envisaged to extend the e-mail services for all Punjab Government employees in due course of time.