Peer to Peer connectionKX-NS1000

Rev1.0 25 Oct., 2011

Introduction

P2P (Peer to Peer connection) This PBX automatically establishes peer-to-peer communication between peer-to-peer compatible IP extensions (i.e., IP-PTs and SIP extensions) that belong to the same P2P group. With peer-to-peer calls, the call is routed directly from one IP extension to another without going through a DSP card.

Table of Contents

3) Programming

1) Overview

Chapter

2) How it work?

Chapter 1

Overview

1. Overview

Type of connection?

P2P Scenarios

P2P calls can be established between telephones in a single site or across sites. The following illustrations show P2P calls established in a variety of network configurations. It is assumed that all the devices are connected over a private IP network.

Within a same site

Between branch offices over a VPN (hub-and-spoke connection)*1

Between branch offices over a VPN (mesh connection)

Between sites with multiple PBXs

SignalingSignaling

VPN Router

VPN Router VPN Router

VPN

Voice path

VPN Path

SignalingSignaling

VPN Router (Center)

VPN Router

VPNVoice path

VPN Path

1. Overview

VPN connection arrangement

Mesh Hub & Spoke

Call Signaling Path (MGCP/SIP) :Via NS

Voice Traffic Path (RTP) : Via Center Router

Call Signaling Path (MGCP/SIP) :Via NS

Voice Traffic Path (RTP) : Via Center RouterCall Signaling Path (MGCP/SIP) :Via NS

Voice Traffic Path (RTP) : Direct through Each Router

Call Signaling Path (MGCP/SIP) :Via NS

Voice Traffic Path (RTP) : Direct through Each Router

VPN Router

1. Overview

P2P Groups

• Telephones must belong to the same P2P group to establish a P2P connection. Telephones at different sites can be assigned to the same P2P group.

• Each PBX in a one-look network is also assigned to a P2P group. This assignment is used when a legacy telephone (e.g., an SLT) is on a call with an IP telephone at another branch. If the PBX and the IP telephone both belong to the same P2P group, a P2P connection is established between the IP telephone and the PBX.

Type of connection?

Connection between different devices is in P2P groups

The PBX group assignment is used when an IP telephone establishes a call with a non-IP telephone (e.g., an SLT). If the non-IP telephone’s PBX and the IP telephone are in the same P2P group, a P2P connection is established between the IP telephone and the PBX:

• Three codecs are used for peer-to-peer calls: G.722, G.711, and G.729A. The speech quality of the codecs varies as follows: (High) G.722, G.711, G.729A (Low).

When the preferred codec of each party differs, the call will be established using the lower codec. For example, if the caller prefers G.711 while the called party prefers G.729A, the call will be established using G.729A.

• G.722 is only available for calls between KX-NT300 series IP-PTs and some SIP extensions that support this codec during peer-to-peer communication.

• Through system programming, it is possible to assign the preferred codec to use for IP-PTs and KX-UT series SIP phones.

• For non-KX-UT series SIP extensions, the priority of the codec that will be used can be specified via the telephone itself.

• For non-peer-to-peer calls via the DSP card, calls cannot be made or received when all of the card’s resources are being used.

General condition

1. Overview

Chapter 2

How it work?

2. How it work?

Within a site

Calls between IP telephones within a site establish a P2P connection.

VPN

Site A Site B

Control Packet

Voice Packet

2. How it work?

Between Branch Offices Over a VPN (Hub and Spoke)

Calls between IP telephones in separate branch offices establish a P2P connection, using the hub router at Site 1 to communicate over a VPN.*When the VPN uses a hub-and-spoke (star) topology, the hub router must be configured to allow U-turn connections.

Control Packet

Voice Packet

VPNSite A

VPN

Site B

Site C

2. How it work?

Calls between IP telephones in separate branch offices establish a P2P connection directly through the VPN routers at each branch.

Between Branch Offices Over a VPN (Mesh)

Control Packet

Voice Packet

VPNSite A

VPN

VPN

Site B

Site C

2. How it work?

Calls between telephones in separate sites, each with its own PBX, establish a P2P connection over a VPN.

Between Sites with Multiple PBXs

Control Packet

Voice Packet

VPN

Site A Site B

2. How it work?

P2P Groups

P2P Group 1 P2P Group 2

P2P Call due call within

same P2P Group

DSP

Main Unit

Non-P2P call due call between different P2P

Group

2. How it work?

Connection between different devices in same P2P groups

P2P Group 1

While the call between site then DSP used at PBX connect with legacy

device

Master

VoIP-GW

IP-PT belong to Main Unit 2

Slave

DSP at Main Unit 2 is not used and IP-PT directly access to DSP at Main

Unit 1.

2. How it work?

Non-P2P call

“RTP Switch” call path EXT to EXT

P2P Group 1

Main Unit 2Main Unit 1 DSP

P2P Group 2

DSP

“RTP Relay” call path EXT to CO

P2P Group 1

Main Unit 1 DSP

2. How it work?

P2P bandwidth control

P2P Group1 　 (HQ) P2P Group2 (Branch 1)

P2P Group2 　 (Branch 2) P2P Group4 　 (Branch 3)

Narrow Band

Wide band

Combination Of P2P Group (setting) Bandwidth Control

Grouop1(Disable) Group2(Disable) None

Group1(Disable) Group3(Disable) None

Group1(Disable) Group4(Enable) Deploy

Group2(Disable) Group3(Diable) None

Group2(Disable) Group4(Enable) Deploy

Group3(Disable) Group4(Enable) Deploy

Chapter 3 How to program?

3 How to program?

Define P2P Group for the system

3 How to program?

Define P2P Group for the Extension ( NT/UT/SIP-SLT)

3 How to program?

Define P2P Codec Priority

3 How to program?

Define bandwidth control or not for P2P Group

Thank you !The END