[asterisk-users] P2P

Wed Nov 19 10:52:20 CST 2008

Many phones can do direct dialing. I just tried it with the Grandstream
GXP280 phones I am using to test an application I am developing.

For this test I have the phones connected to each other via an Ethernet
patch cable. Both phones have IP addresses on the same network.  On either
phone I select the option to do "Direct IP call" and enter the IP address of
the phone I want to call. No asterisk or anything involved.

Here is info from the manual:

Making Calls using IP Addresses
Direct IP calling allows two phones to talk to each other in an ad hoc
fashion without a SIP proxy.  VoIP calls can be made between two phones if:
€ Both phones have public IP addresses, or
€ Both phones are on a same LAN/VPN using private or public IP addresses, or
€ Both phones can be connected through a router using public or private IP
addresses (with necessary port forwarding or DMZ)
To make a direct IP call, please follow these steps:
1. Press MENU button to bring up MAIN MENU.
2. Select ³Direct IP Call² using the arrow-keys.
3. Press OK to select.
4. Input the 12-digit target IP address. (Please see example below).
5. Press OK key to initiate call.

To make a quick IP call, please see next section.

For example:  If the target IP address is 192.168.1.60 and the port is 5062
(e.g. 192.168.1.60:5062),
input the following: 192*168*1*60#5062 -   The ³ * ² key represent the
dot³.² ; The ³#² key represent colon ³:².  Press OK to dial out.

Quick IP Call Mode 

The GXP also supports Quick IP call mode. This enables the phone to make
direct IP-calls, using only the last few digits (last octet) of the target
phone¹s IP-number. This is possible only if both phones are in under the
same LAN/VPN. This simulates a PBX function using the CMSA/CD without a SIP
server. Controlled static IP usage is recommended.

Setting up the phone to make Quick IP calls
To enable Quick IP calls, the phone has to be setup first. This is done
through the web-setup function. In the ³Advanced Settings² page, set the
"Use Quick IP-call mode to YES. When #xxx is dialed, where x is 0-9 and xxx
<=255, a direct IP call to aaa.bbb.ccc.XXX is completed. ³aaa.bbb.ccc² is
from the local IP address regardless of subnet mask. The numbers #xx or #x
are also valid. The leading 0 is not required (but OK).

For example:   
192.168.0.2 calling 192.168.0.3 -- dial #3 follow by SEND or #
192.168.0.2 calling 192.168.0.23 -- dial #23 follow by SEND or #
192.168.0.2 calling 192.168.0.123 -- dial #123 follow by SEND or #
192.168.0.2: dial #3 and #03 and #003 results in the same call -- call
192.168.0.3 

NOTE:  If you have a SIP Server configured, a Direct IP-IP still works. If
you are using STUN, the Direct IP-IP call will also use STUN. Configure the
³Use Random Port² to ³NO² when completing Direct IP calls.
-- 
Jim Dickenson
mailto:dickenson at cfmc.com

CfMC
http://www.cfmc.com/

> From: Valentin Bud <valentin.bud at gmail.com>
> Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion
> <asterisk-users at lists.digium.com>
> Date: Wed, 19 Nov 2008 15:15:30 +0200
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> <asterisk-users at lists.digium.com>
> Subject: Re: [asterisk-users] P2P
> 
> Hi Mario,
> 
>> Hi Valetin,
>> 
>> Valentin Bud wrote:
>>> Are the VoIP phone "mobile" on the internet or in fixed locations?
>>> If they are in fixed locations and they have to go through internet to reach
>>> the asterisk box, the way *i* would do it is with VPN tunnels. If they
>>> are in the same
>>> location (LAN) it is very simple, you just need the phones and an asterisk
>>> box with a network card as you said. You configure the phones to register
>>> with
>>> the asterisk and configure the dialplan and you are good to go.
>>> 
>>> 
>> They are in the same network/lan. Can you recommend and hard phones for
>> this task? Are there phones which can be used without asterisk in
>> between them?
> 
> I'm new in this VoIP / Asterisk business and the only hard phones i
> have used are
> Linksys SPA 901, 921, 922. Stay away from 901, they only bring problems. The
> 921
> are very good and they even have an LCD. The 922  is something like
> 921 but they know
> PoE and the have a builtin switch so you can connect the phone to the
> wall plug and from
> the phone you connect the computer. The switch is 10/100.
> 
>  My wishlist for 922 would be: 1 Gig switch and the voice vlan that is
> used on the cisco switches
> so you can separate the voice traffic from the data traffic, all this
> if you use the builtin switch.
> 
>  There might be some phones that can handle calls between them without
> the need of a proxy
> (asterisk) but honestly i do not know. I repeat i am new in this
> business but into it :).
> 
> all the best and a great day,
> v
>> 
>> Thanks,
>> Mario
>> 
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