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:[EMAIL PROTECTED] CfMC http://www.cfmc.com/ > From: Valentin Bud <[EMAIL PROTECTED]> > Reply-To: Asterisk Users Mailing List - Non-Commercial Discussion > <[email protected]> > Date: Wed, 19 Nov 2008 15:15:30 +0200 > To: Asterisk Users Mailing List - Non-Commercial Discussion > <[email protected]> > 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 >> >> _______________________________________________ >> -- Bandwidth and Colocation Provided by http://www.api-digital.com -- >> >> asterisk-users mailing list >> To UNSUBSCRIBE or update options visit: >> http://lists.digium.com/mailman/listinfo/asterisk-users >> > > _______________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
