multiple SIP phones, how many SPs?
wjcarpenter:
I'm just starting to try to figure this out, so I'm hoping the answer is obvious to anyone who has studied harder. :)
I have a handfull of Cisco 7941/7961 phones and want to sprinkle them around my house to work with my Obi202. I plan to configure them with SIP firmware. This blog posting has an explanation of the configuration (which I haven't tried yet):
http://blog.obihai.com/2012/08/use-your-obi202-as-google-voice-gateway.html
I am already using SP1, SP2, and SP3. I have SP4 available, so it's obvious to me that I can configure at least one of those Cisco phones to work. What is unclear to me is if I can configure multiple of those Cisco phones on that single SP4 or if it has to match up as one extension with one SP.
Ideas?
drgeoff:
My reading of http://www.obihai.com/docs/OBi-VoIP-Device-Attach-Legacy-IP-Phone-Workbook-v1-0.pdf is that the AuthUserName on the Obi202 SP slot and the IP phone must be the same. That implies one IP phone per SP slot.
wjcarpenter:
Thanks, I didn't know about that PDF document, which looks like an evolution of the blog post I linked to.
It also looks to me like it's 1-to-1, but maybe someone will know how to do it another way.
If I can't figure it out with just an OBi202, I'll probably later run Asterisk on a Raspberry Pi and slave all of the Cisco phones off of that. Another solution might be to pick up an OBi200 (in the sale coming up next week) and slave 3 Cisco phones off that.
azrobert:
I just registered 2 devices to a single SP trunk on an OBi200. The first is the CSipsimple softphone on an Android and the second the Phonerlite softphone on Windows. It's been a long time since I played with this option, but I think I got 3 devices to register in the past. I never tried more. Each device uses the same credentials. You will need to increase the parm MaxSessions. To be safe I would use 2 sessions for each device.
Voice Services -> SP4 Service -> MaxSessions: 6
I never got "555555555.pnn.obihai.com:5063" to work. I use the IP address and port of my OBi200, as in the second option in drgeoff's link.
I never tried to use {SP2(1001@local_client)} as in your link, to route inbound calls. I just tried and it's flakey with multiple devices registered. It works with 1 device. When I registered the 2nd, only the 2nd device rang. I then closed the 2nd device and the 1st device wouldn't ring.
I route inbound calls to the IP address and port of the device like this:
sp4(1001@192.168.1.100:5060),sp4(1001@192.168.1.110:5070)
You can route an inbound call to a max of 4 devices using the above method. Some people had trouble routing calls like this to a Cisco phone. You can check the IP address and port of the registered device using OBi expert. Go to System -> System Status. Under SP4 Service Status the IP address and port of the LAST device registered will be displayed.
Edit:
You will probably need to increase MaxSessions on your service provider trunks. You will need 1 session for each simultaneous inbound and outbound call on the trunk.
wjcarpenter:
Thanks for the suggestions. I'm starting to lean more and more toward doing the Cisco phones on a separate Asterisk installation, with the OBi202 acting as the trunk gateway and also handling the two local POTS lines.
Maybe I should say more about what I am trying to accomplish, and maybe there will be an easier way to do it.
This is my home phone set-up. I've got the OBi202 working fine with Google Voice (with incoming calls routed through Callcentric to pick up calling names from our contacts; and, the usual Anveo 911 service; so that's the three SP slots). We use a 2-line cordless phone, and the call routing on the OBi202 rolls over from line 1 to line 2 if line 1 is busy. We can make outbound calls on either line 1 or line 2. Life is good, and the OBiTALK portal makes it pretty darned easy to set all that up.
I've got a small pile of Cisco 740x and 760x phones. For some things, they are a better device than the cordless phone handsets. I'd like to set them up so that they seem to a naive user like additional POTS extensions. In other words, when POTS line 1 or 2 rings, I'd like the Cisco phones to also ring and be able to answer calls. And, I need to be able to make outbound calls from the Cisco phones.
Oh, most important, I need to be able to configure all that without the wife asking me why the phones are all screwed up. :-)
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