1. Protocol Support
   1. SIP RFC 3261
   2. Support for Re-INVITE, PRACK, REFER
2. Border Control Features
   1. Stateful Session Control
      1. Call authorization by IP address or user name and password
      2. Maximum Calls Allowed from / to a Carrier partner.
   2. Option of Full Proxy or Session Proxy Mode, on a case by case basis.
   3. Masking of RTP Traffic IP addresses
3. Media Proxy (NAT Traversal & Topology Hiding)
   1. Media Proxy can authenticate devices behind Symmetric NAT and provide a channel to transfer voice packets.
   2. Provides dynamic channel and resource allocation mechanisms that allow for improved security of the network, making it impossible for intruders to find a way into the network under the disguise of an authorized channel.
4. Switch Partitioning for Multi-Layer Partition Groups with Access Control and different user privileges.
5. Provisioning Features:
   1. End-to-end Real time Call tracing Capability
   2. Dynamic Modifications of configuration settings during Operations
   3. Real-time provisioning of Routes and Calling Plans through a web based Interface
      1. Unlimited Routing Tables
      2. Multiple Numbering Plans – International, National, Local
      3. Carrier Identification Code (CIC)
   4. Number Translation
      1. N-digit subscriber numbers
      2. Short / Prefixed number dialing for local / long-distance calls
      3. Support for Multiple Aliases
      4. Source / Destination number translation as required by different carriers
      5. Source Number Disguise
   5. T.38 Fax (Group 3 and Group 4) pass-through
   6. Auto Inband / Outband DTMF over IP
   7. Automatic Call Distribution (ACD): Simultaneous, Round-robin or Sequential Manner
   8. Interoperable with large number of Media Gateways, IADs, IP Phones, VoIP Adaptors and Softphones.

PacketUnity 5.0 provides advanced Call Routing Algorithms for Carrier Interconnects. These include:

1. Least Cost Routing (LCR)
2. Loss Less LCR
3. Destination based Routing
4. Preferred Routing
5. Prefix / Suffix based Routing
6. Gateway / Route Capacity based Routing
7. Profit based Routing
8. Percentage Based Routing
9. Source Based Routing – Routing specific to User or Group
10. Private / Public ENUM Registry Lookup