Grandstream Networks GRP26 Series Manuale utente

Grandstream Networks, Inc.

GRP26XX Carrier-Grade IP Phones

Auto-configuration “Plug and Play” Guide

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 Plug and Play Guide for GRP26xx series 
Table of Content
INTRODUCTION...........................................................................................................................3 
PLUG AND PLAY OPTION ..........................................................................................................4 
Step 1: Sending SUBSCRIBE ................................................................................................................ 4 
Step 2: creating configuration file in PBX................................................................................................ 5 
Step 3: Sending sip NOTIFY to the phone.............................................................................................. 5 
Step 4: Getting provisioned.................................................................................................................... 6 
REMARKS....................................................................................................................................7 
 
 Table of Figures 
Figure 1: SIP SUBSCRIBE............................................................................................................4 
Figure 2: SIP NOTIFY...................................................................................................................5

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Plug and Play Guide for GRP26xx series

INTRODUCTION

This is a technical guide targeted to PBX developers that want to learn the different mechanisms that

GRP26XX phones support to get provisioned with other systems.

Currently GRP26XX phones can use OPTION66, auto-provision with TFTP, HTTP and HTTPS, Web

interface and now with a device auto recognition option that Grandstream called Plug andPlay.

The purpose of his option is to make an easy installation of the GRP device, by zero configuration with just

having the user to connect the phone to a LAN via a hub/switch/router. Once the phone is connected to the

LAN, a PBX should be able to detect it and display the phone information in its console or web interface.

The PBX user should be able to select the new phone detected and assign the basic configuration a phone

needs to at least make a sip registration against the PBX. As well as been able to place and receive phone

calls, for example; Sip User ID or extension number, sip password and Caller name. Other configuration

can be provisioned to the phone like; prefer audio codecs, Speed Dial keys or BLF (Busy Lamp Field) and

most important indicating the server path of configuration and firmware server.

Plug and Play option needs to be supported in both the IP phone and the PBX. Here you will find the

technical detailsof howthephoneengagesinthismechanism.PBXdevelopersneedtoadapttheirsystem to

interact with Grandstream IP Phones.

Note: GRP26xx series include, GRP261x and GRP260x series, GRP2624 and GRP2634 models.

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Plug and Play Guide for GRP26xx series

PLUG AND PLAY OPTION

First make sure the following guidelines are met:

GRP26XX phone should be reset to factory default or out of the box

GRP26XX and PBX (support Plug and Play) are in the same local areanetwork

Step 1: Sending SUBSCRIBE

When the phone boots up, it will start sending a sip SUBSCRIBE message to a multicast IP address

224.0.1.75. The phone will send SUBSCRIBE for 5 times and stop IF no response from the server or when

receiving 200 or 500. It will ignore errors like 30x and 4xx.

Below is how the SUBSCRIBE message looks like:

Description of the SUBSCRIBE message:

Request URI user part: Contains device MAC address with following format

MAC%3A000B82F55284

Contact: IP address and port of the phone

User-Agent: Contains Vendor, Model and firmware version

Event: Contains information about the phone like

ua-profile, profile-type, vendor, model and version

Figure 1: SIP SUBSCRIBE

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Plug and Play Guide for GRP26xx series

Step 2: creating configuration file in PBX

Per detection of the SUBSCRIBE message, the PBX should display the phone in its device manager tool.

Theadministratorshouldbeabletoseethevendor’s name,model, firmware version and MAC address then

he can right-click on the device and assign the corresponding account information. Oncethe configuration

is saved from the device manager tool, the PBX should create the configuration file and send it to the

provisioning server location.

Note: Grandstream configuration file can be generated in two different ways.

A- By utilizing a Grandstream encoder tool (Java API is available)

B- By Creating an XML text file. For more information on how to accomplish these methods, please visit:

Step 3: Sending sip NOTIFY to the phone

After PBX generates the configuration file, it will then need to notify the phone where to find it. This is done

by sending a sip NOTIFY with the URL indicating where to download the configuration file.

Below is how the NOTIFY lookslike:

Note:

The last line (Message Body) contains the URL that the phone will use to download the configuration file.

The phone will reply 200 OK If this header is included otherwise it will reply 4XX or 5XX.

Figure 2: SIP NOTIFY

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Plug and Play Guide for GRP26xx series

Step 4: Getting provisioned

The phone will immediately open a TCP connection to the URL indicated in the NOTIFY, begins downloading

the configuration file and flash it.

Phone will reboot to take effect new configuration and a second attempt to download a configuration file will

occur. This time the phone will do a checksum and If the file is the same as the previous one downloaded

then it will discard flashing in memory again.

Phone is ready to use with new configuration.

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Plug and Play Guide for GRP26xx series

REMARKS

All GRP phones will engage the Plug and Play option at boot up, if no NOTIFY is received then the phone

will continue with normal provisioning mechanism, meaning checking for an OPTION66 message, If nothing

received then go to the indicated URL in the phone’s configuration.

The Plug and Play option was developed and verified operation originally with 3CX phone systems.

For more technical related questions please contact Grandstream support team at

support@grandstream.com

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