Video Transcript
Intro to VoIP Telephony (Part 4)
3m 19s
00:07
Welcome back. Alright, last video. We're gonna leave you with a few tips for VoIP.
00:13
First one - If you have a cloud or hosted solution, and you can’t reach it with Q-SYS, try enabling STUN.
00:20
Then ask the provider if the domain is needed.
00:23
The username may not be unique and isn't always equal to authentication ID.
00:29
Certainly in Call Manager, it is not.
00:31
Alright, next one. In Cisco Call manager, there’s something called a media termination point.
00:37
Technically, it's no longer required but not in all cases.
00:41
There are a few edge cases where enabling it will get it working again.
00:46
In cisco call manager there's actually two different ways that you can set up a third party SIP device: basic and advanced.
00:54
With basic, you’re only enabling one extension.
00:57
So if you're using multiple softphones within a single Core,
01:01
you would have to use advanced, which allows up to 8 softphones.
01:05
If you need more than 8, you would actually use a SIP trunk, which allows for unlimited softphones.
01:12
When you're troubleshooting, take a look at the SIP traffic.
01:15
This will show us what device is sending the CANCEL or BYE messages.
01:20
And, once you know which device is stopping or preventing the call, we want to know why.
01:25
Usually, if the device is sending a BYE message mid-call for no reason it will provide an error code.
01:31
Feel free to do a search online for that code.
01:34
And if all else fails, and you can't find the code or you can't figure it out,
01:39
you should contact your administrator of that device or system to help you understand the why.
01:45
In most cases, it's the fault of some configuration on their side.
01:48
But at least we can get the customer pointed in the right direction whether it's on our side or theirs.
01:54
Enable softphone event logging if you want to do data gathering for troubleshooting.
01:59
Recall that if you enable logging within the softphone you're going to log all of the SIP traffic.
02:05
You're not getting any audio. Use this URL to find out: http:// - then your Core's IP address - /SIP.text.
02:17
It's gonna look like a plaintext website that shows all of your SIP logs.
02:22
Then if you want to get the network capture: go to http:///pcap_capture.html
02:35
Make sure the packet length is set to 1600.
02:37
Our engineer thought it would be useful for customers to be able to define that for themselves.
02:43
But in most cases that just caused problems because people would leave that blank,
02:48
in which case they're capturing packets of length zero, which means that you are basically capturing nothing.
02:55
You may need a successful call vs an unsuccessful call explained in detail.
03:01
Then you can also extract the logs as well.
03:03
You can also extract the system logs because there's SIP information in there too.
03:07
These are good tools that you can use for yourself, just to look at the SIP traffic and find out what's going on.
03:12
Alright, we made it to the end. Thanks for watching and we’ll see you next time.
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Intro to VoIP Telephony (Part 4)
3m 19s