SIP-based VRS Providers

GraysonPeddie · 06-26-2009, 08:44 PM

Hi. I do have a question about whether VRS providers support SIP or not, but while I know this is a technical post that I'm about to write, I'd like to brief anyone about SIP. SIP is Session Initiated Protocol. It allows invitation (phones ringing, for example), acknowledgement (this is when session begins), terminate session (either by sending a "bye" command to complete a call or a "cancel" command if the user initiating a session cancels the call or if a receiving party rejects it), and registration with the proxy server. Please note that SIP does not handle audio/video processing. It's either the hardware or software's responsibility to provide that kind of media, whether it be softphones, video phones, analog telephone adapters, VoIP-based telephones, etc. If anyone is interested in SIP, visit the SIP tutorial. If you want to get your hands dirty in getting technical details of SIP, read RFC 3261.

With that out of the way, do any video relay service providers have support for SIP?

Here is the scenario for why I've asked: I have trixbox running in a custom-built server. Because trixbox is PBX-based, I can assign an extension number for a video phone. Pretend that I have four video phones: one in living room, one in the kitchen or dining room, one in the study room, and one in the bedroom. It's a lot of video phones, but think about that for a minute. Since the extensions I'll be giving will have a max digits of 2, the extensions for the video phones start at 20. So, extension 20 for the living room, 21 for the kitchen/dining room, 22 for the study room, and 23 for the bedroom. trixbox (yes, the spelling is intentional; it's "t" instead of "T.") has a ring group setting that can ring in all 4 extensions at once. So, a deaf VP user will dial my phone number and trixbox handles an incoming call (an "INVITE" command sent on behalf of the proxy server from a deaf caller) and because I setup a ring group, trixbox sends out 4 invitations to make the video phones start ringing (one invitation per video phone). If I'm in the dining room, I can initiate (acknowledge) a call from there. In doing so, trixbox cancels out the other video phones that were still ringing. trixbox then will send an acknowledgement back to a proxy server, which initiates the SIP session, and video communication can take place during the session.

What this means, is you don't have to have a separate 10-digit phone number per VP device that you have at home, which is very illogical and impractical to have for your home.

And yes, trixbox does have support for video-based communication.

I strongly doubt that VP200 is a SIP-based video phone, or am I wrong? Currently, I'm using CallCentric for audio-based communications (pay-per-call service), so if I plan on using VRS in the future, are there any VRS providers that are friendly to technical users who know how to setup a SIP-based video phone?

JClarke · 06-26-2009, 08:59 PM

My Australian VRS service uses SIP system

GraysonPeddie · 06-26-2009, 09:11 PM

I live in the US, but thanks.

TechBill · 06-26-2009, 11:32 PM

I think VPAD+, CDVRS, SnapOjo, MVP are all using SIP based protocol.

Not sure about Sorenson since incoming calls would not work without port 1720 so it probably still using H323 protocol.

I was able to use VPAD+ relay service from any wifi spots, coffee shop, hotel, etc but no battery pack yet.

.

radioman · 06-26-2009, 11:39 PM

vp100 uses h323. vp200 uses h326. both sip on 1720 ring port.

GraysonPeddie · 06-27-2009, 10:37 AM

Okay, so if I were to register trixbox with Viable or CSDVRS, will they see trixbox as a registered videophone once I add a SIP trunk?

Here's what it looks like:

Once it's done, I can setup an inbound route. So, when a deaf caller dials a Viable/CSDVRS number, trixbox will then route the call to its destination that I can assign, whether it be an extension number, ring group, etc. So, when I begin to add extensions for a couple of video phones (even remote extensions, too, if I decide to use a VPAD remotely from home using Wi-Fi hotspot), can VPAD communite directly with trixbox (as a reminder, it's Asterisk=based with freePBX added to it)?

(I love working with software-based PBX systems... I'm thinking that maybe in the future, I think that a video relay-based conference can work for businesses with d/Deaf employees, but who knows. Or, maybe they can hire an interpreter and start a secondary video conference for the d/Deaf, bypassing the VRS! Or, how about an SIP-based captioned teleconference as an alternative to sign language when speech recognition is used? Of course, it great for those who work from home.)

06-26-2009, 08:44 PM	#1 (permalink)
GraysonPeddie Eye/Hear/Speech Impaired Join Date: May 2006 Location: Tallahassee, FL 32310 Posts: 1,083	SIP-based VRS Providers Hi. I do have a question about whether VRS providers support SIP or not, but while I know this is a technical post that I'm about to write, I'd like to brief anyone about SIP. SIP is Session Initiated Protocol. It allows invitation (phones ringing, for example), acknowledgement (this is when session begins), terminate session (either by sending a "bye" command to complete a call or a "cancel" command if the user initiating a session cancels the call or if a receiving party rejects it), and registration with the proxy server. Please note that SIP does not handle audio/video processing. It's either the hardware or software's responsibility to provide that kind of media, whether it be softphones, video phones, analog telephone adapters, VoIP-based telephones, etc. If anyone is interested in SIP, visit the SIP tutorial. If you want to get your hands dirty in getting technical details of SIP, read RFC 3261. With that out of the way, do any video relay service providers have support for SIP? Here is the scenario for why I've asked: I have trixbox running in a custom-built server. Because trixbox is PBX-based, I can assign an extension number for a video phone. Pretend that I have four video phones: one in living room, one in the kitchen or dining room, one in the study room, and one in the bedroom. It's a lot of video phones, but think about that for a minute. Since the extensions I'll be giving will have a max digits of 2, the extensions for the video phones start at 20. So, extension 20 for the living room, 21 for the kitchen/dining room, 22 for the study room, and 23 for the bedroom. trixbox (yes, the spelling is intentional; it's "t" instead of "T.") has a ring group setting that can ring in all 4 extensions at once. So, a deaf VP user will dial my phone number and trixbox handles an incoming call (an "INVITE" command sent on behalf of the proxy server from a deaf caller) and because I setup a ring group, trixbox sends out 4 invitations to make the video phones start ringing (one invitation per video phone). If I'm in the dining room, I can initiate (acknowledge) a call from there. In doing so, trixbox cancels out the other video phones that were still ringing. trixbox then will send an acknowledgement back to a proxy server, which initiates the SIP session, and video communication can take place during the session. What this means, is you don't have to have a separate 10-digit phone number per VP device that you have at home, which is very illogical and impractical to have for your home. And yes, trixbox does have support for video-based communication. I strongly doubt that VP200 is a SIP-based video phone, or am I wrong? Currently, I'm using CallCentric for audio-based communications (pay-per-call service), so if I plan on using VRS in the future, are there any VRS providers that are friendly to technical users who know how to setup a SIP-based video phone? __________________ ASL Tutorials: http://www.lifeprint.com/asl101/page...t/concepts.htm www.lessontutor.com/ASLgenhome.html ASL Grammar: http://daphne.palomar.edu/kstruxness...les%201-06.pdf ASL Browser: http://commtechlab.msu.edu/sites/aslweb/browser.htm www.lifeprint.com/asl101/pages-layout/signs.htm www.aslpro.com

06-26-2009, 09:11 PM	#3 (permalink)
GraysonPeddie Eye/Hear/Speech Impaired Join Date: May 2006 Location: Tallahassee, FL 32310 Posts: 1,083	I live in the US, but thanks. __________________ ASL Tutorials: http://www.lifeprint.com/asl101/page...t/concepts.htm www.lessontutor.com/ASLgenhome.html ASL Grammar: http://daphne.palomar.edu/kstruxness...les%201-06.pdf ASL Browser: http://commtechlab.msu.edu/sites/aslweb/browser.htm www.lifeprint.com/asl101/pages-layout/signs.htm www.aslpro.com

06-27-2009, 10:37 AM	#6 (permalink)
GraysonPeddie Eye/Hear/Speech Impaired Join Date: May 2006 Location: Tallahassee, FL 32310 Posts: 1,083	Okay, so if I were to register trixbox with Viable or CSDVRS, will they see trixbox as a registered videophone once I add a SIP trunk? Here's what it looks like: Once it's done, I can setup an inbound route. So, when a deaf caller dials a Viable/CSDVRS number, trixbox will then route the call to its destination that I can assign, whether it be an extension number, ring group, etc. So, when I begin to add extensions for a couple of video phones (even remote extensions, too, if I decide to use a VPAD remotely from home using Wi-Fi hotspot), can VPAD communite directly with trixbox (as a reminder, it's Asterisk=based with freePBX added to it)? (I love working with software-based PBX systems... I'm thinking that maybe in the future, I think that a video relay-based conference can work for businesses with d/Deaf employees, but who knows. Or, maybe they can hire an interpreter and start a secondary video conference for the d/Deaf, bypassing the VRS! Or, how about an SIP-based captioned teleconference as an alternative to sign language when speech recognition is used? Of course, it great for those who work from home.) __________________ ASL Tutorials: http://www.lifeprint.com/asl101/page...t/concepts.htm www.lessontutor.com/ASLgenhome.html ASL Grammar: http://daphne.palomar.edu/kstruxness...les%201-06.pdf ASL Browser: http://commtechlab.msu.edu/sites/aslweb/browser.htm www.lifeprint.com/asl101/pages-layout/signs.htm www.aslpro.com Last edited by GraysonPeddie; 06-27-2009 at 12:05 PM.

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06-26-2009, 08:59 PM	#2 (permalink)
JClarke Good times, good times. Join Date: Nov 2006 Location: Packing bags for U.S.A Posts: 20,240 Blog Entries: 5	My Australian VRS service uses SIP system

06-26-2009, 11:32 PM	#4 (permalink)
TechBill Registered User Join Date: Nov 2006 Posts: 838	I think VPAD+, CDVRS, SnapOjo, MVP are all using SIP based protocol. Not sure about Sorenson since incoming calls would not work without port 1720 so it probably still using H323 protocol. I was able to use VPAD+ relay service from any wifi spots, coffee shop, hotel, etc but no battery pack yet. .

06-26-2009, 11:39 PM	#5 (permalink)
radioman Registered User Join Date: Jun 2008 Posts: 793	vp100 uses h323. vp200 uses h326. both sip on 1720 ring port.