One Way Audio Issues and STUN
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@krisleslie said in SIP Desk Phones Not Re-Registering with Main WAN's IP After WAN Fail-back:
Intra-office calls (so far) are fine no issues. Someone dialing in from outside of our network has the issues mostly.
Can they hear you or can you not hear them?
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@dustinb3403 well right now I'm wondering is there an issue with the STUN server or is there a firewall issue between me and the STUN server. I've used the common one on the internet:
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@dustinb3403 my receptionist can't hear them, however I confirmed she is being heard.
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So inbound one-way audio issues.
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@krisleslie said in SIP Desk Phones Not Re-Registering with Main WAN's IP After WAN Fail-back:
Intra-office calls (so far) are fine no issues. Someone dialing in from outside of our network has the issues mostly.
So, I assume that you have an internal PBX and an external SIP trunk.
If so, this is a firewall / NAT issue.
Edit: wow, shoudl probbaly make a different thread.
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Cloud hosted. I will make a new thread. I apologize.
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@krisleslie said in SIP Desk Phones Not Re-Registering with Main WAN's IP After WAN Fail-back:
Cloud hosted. I will make a new thread. I apologize.
No wait, stop.
Paging @scottalanmiller to fork from here https://mangolassi.it/topic/16604/sip-desk-phones-not-re-registering-with-main-wan-s-ip-after-wan-fail-back/21
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@krisleslie said in One Way Audio Issues and STUN:
Cloud hosted. I will make a new thread. I apologize.
Ok, so one way issues should happen on ext to ext calls too if it was your firewall. It should not be "only" on external calls.
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@JaredBusch I might've missed it, but is @krisleslie system hosted offsite on vultr or some such place?
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@dustinb3403 said in One Way Audio Issues and STUN:
@JaredBusch I might've missed it, but is @krisleslie system hosted offsite on vultr or some such place?
It's on Rackspace.
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This may or may not help.... I ran into a SIP issue last fall at one of our sites. I found IPS triggers in the logs and created an exception in the IPS which fixed the issue.
This started as a one way audio issue.
Here's a cap of the signature database description. We use Watchguard appliances.
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Scott I caught an article on that also this morning how SIP/ALG and IPS need to both be off. Why is it that the things intended to make things "better" tend to need to be off lol. Then when we add STUN to the equation it can also negate any other changes made due to it!
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The SIP/ALG I forgot to turn off last night as I was too busy trying to test out my WDS server
If I stay late tonight and the office is clear, I'm disabling that ALG it seems to be the common cause of all issues and then as far as IPS getting disabled on the Edge Router I dunno how or even if I should!
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Hackers are probing us just not in high volume.
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@krisleslie said in One Way Audio Issues and STUN:
Scott I caught an article on that also this morning how SIP/ALG and IPS need to both be off. Why is it that the things intended to make things "better" tend to need to be off lol. Then when we add STUN to the equation it can also negate any other changes made due to it!
ALG should normally always be off, and Jarod always disables in on ER devices. We've had good luck in it not breaking there (it definitely breaks on every other device we know of.) ALG is not designed to fix anything, AFAIK, it is literally intended to break SIP, it's never fixed anything and there was nothing to fix.
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@scottalanmiller WOW can I become one of the IETF that proposes things to break things! I'm sure I can do a good job lol
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@krisleslie said in One Way Audio Issues and STUN:
@scottalanmiller WOW can I become one of the IETF that proposes things to break things! I'm sure I can do a good job lol
Not aware of ALG as any standard. Just an industry option for "break SIP".
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@scottalanmiller said in One Way Audio Issues and STUN:
@krisleslie said in One Way Audio Issues and STUN:
@scottalanmiller WOW can I become one of the IETF that proposes things to break things! I'm sure I can do a good job lol
Not aware of ALG as any standard. Just an industry option for "break SIP".
ALG was part of the SIP Examples RFC (I have read this before but had to google it up again).
https://tools.ietf.org/html/rfc3665
The problem with ALG is that, if I understand how it was originally designed, it is basically a MitM on SIP traffic.
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@jaredbusch said in One Way Audio Issues and STUN:
The problem with ALG is that, if I understand how it was originally designed, it is basically a MitM on SIP traffic.
That's my understanding of it, and how it is implemented. Had no idea there was a standard for that mess.
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I've never turned on ALG. I caught this because I have a catchall proxy at the end of my policies for outgoing TCP/UDP/DNS that might have slipped through my other policies. It makes sure that everything is scanned and IPS hopefully catches what I may have missed.
