http://voicent.com/blog Just another WordPress weblog Tue, 31 Mar 2009 00:09:10 +0000 http://backend.userland.com/rss092 en 1. A full cone NAT is one where all requests from the same internal IP address and port are mapped to the same external IP address and port. Any external host can send a packet to the internal host, by sending a packet to the mapped external address. 2. A restricted ... http://voicent.com/blog/index.php/technology/voip/126/firewall-types Real time media protocol based on UDP for voice. Separate from SIP. SIP establish connection and port numbers for RTP. Not necessary using the same path. Audio Quality depends on codec. ILBC used for google talk and Gizmo, Skype. http://voicent.com/blog/index.php/technology/voip/125/rtp-real-time-transport-protocol When a SIP phone starts, it first register itself with the SIP registrar. 1. SIP phone send HTTP request to SIP registrar 2. SIP registrar send SIP phone info to a location database (ip address etc) 3. ACK SIP phone Basic call flow: 1. Invite from a SIP phone to SIP registrar (Proxy) 2. Proxy query ... http://voicent.com/blog/index.php/technology/voip/124/sip-registrar-and-call-flow SIP Express Router: Free GPL-ed SIP server (registrar, proxy, redirect) http://iptel.org/ser/features De-facto standard SER: domains, subscribers Routing language extension modules http://iptel.org/download http://voicent.com/blog/index.php/technology/voip/123/sip-express-router-ser INVITE: initiates sessions ACK CANCEL BYE REGISTER OPTIONS SIP extension methods: SUBSCRIBE/NOTIFY/MESSAGE: instant messaging REFER: call transfer PRACK: provisional reliable responses INFO UPDATE http://voicent.com/blog/index.php/technology/voip/122/sip-method SIP Phones (User-Agents) SIP Servers (Registratar, Proxy, Redirect) SIP PSTN Gateways Application Servers (Media Servers) http://voicent.com/blog/index.php/technology/voip/121/sip-components Voicent provides inbound and outbound development platform for developers with telephony technology tools to create your own application based on Voicent SDK. For outboand applications, you can develop applications by integrate with BroadcastByPhone and AutoReminder web interface or command line interface. You may also develop applications directly based on Voicent Gateway and SDK. For inbound applications, ... http://voicent.com/blog/index.php/business/120/partner The number of phone lines is determined by your computer’s PCI slot. Voicent software can support unlimited phone lines. The restriction is limited PCI slots on each computer. For large group of phone lines, you need to consider using mulitple computers with networking. This is our enterprise edition od BroadcastByPhone. For your integration, you can ... http://voicent.com/blog/index.php/technology/119/developer The modem have two RJ-11 phone jacks: One is “LINE” jack. The other is “PHONE” jack. The “LINE” jack connects to the phone line for outbound call. The “PHONE” jack connects to a phone as inbound call. For more information on setup voice modem, see FAQ #6 at http://voicent.com/support The license is unlimit time. ... http://voicent.com/blog/index.php/support-archive/118/voice-modem-6 Yes we do have reseller’s program you can sign up for. To sign up, please see http://voicent.com/affiliate/reseller.html > We sell document imaging software to doctors offices amoung other types of > compaines. I was wondering if you had any reseller discounts as I would be > interested in reselling your appointment reminder app. > > ... http://voicent.com/blog/index.php/business/117/reseller