Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC
 ·North State Commun..
| [Info] ONT interfering with SIP?
Hello Folks,
I am at my wits end waiting on my provider to send a tech onsite. So I wanted to see if this makes sense to anyone.
Does anyone know if an ONT can interfere with SIP traffic? Here's why I ask. I had my ONT replaced (a Tellabs) because after 2 years, it failed. After replacement with a different brand, I started having issues with my SIP phones. When connecting to my VoIP server (in a datacenter) instead of my traffic connecting on port 5060 (like all my other users do) my port is reported as 49152. My phone will log in, but I cannot answer calls that come in even though I see them ringing on my phone.
I've bypassed my router and given a public IP to my phone, but then it won't log in AT ALL. If I plug the phone into my backup Road Runner connection, it immediately logs in on port 5060. |
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
 ·Hollis Hosting
·Verizon Online DSL
·Fairpoint Communic..
| Just a guess but is sounds like you may be behind a NAT router.
When you say: "I've bypassed my router and given a public IP to my phone" how did you determine what the public IP was? I assume this is a residential connection with dynamical assigned IP addresses?
/tom |
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Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC
·North State Commun..
| said by tschmidt  :Just a guess but is sounds like you may be behind a NAT router. When you say: "I've bypassed my router and given a public IP to my phone" how did you determine what the public IP was? I assume this is a residential connection with dynamical assigned IP addresses? /tom Good Morning Tom,
My ISP assigns as many DHCP addresses as I want. So I plugged my ethernet connection (my ONT terminates to CAT-5e in my house) into a switch, ran a cable to my Polycom 501 and another to my router. When the Polycom boots, it shows a status screen with all the IP info. It had a 74.x IP. When I am on my providers 74. subnet, I can't get SIP packets to my SIP server AT ALL. When I am on their old 212.x subnet, I can get them there, but I cannot get RTP working. So I can make/receive calls, but I don't get any audio.
Interestingly enough, I did a Wireshark packet capture last night and my phone sends packets, but none return from our sip server. HOWEVER, if I ping the SIP sever or browse to the administrative pages, I see both my packets and the response.
Additionally, I have my laptop connected to my neighbors Road Runner connection via wireless, then I enabled ICS. My phone connects to the SIP server just fine.
This behavior started when my original Tellabs ONT died and they replaced it with a new brand. I'm also having other issues, like all traffic dying for 10 seconds or so, which causes my streaming radio station to pause and my VPN to drop. |
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
·Hollis Hosting
·Verizon Online DSL
·Fairpoint Communic..
| SIP is just for setup and teardown. Actual stream is direct. Since you are having other steaming problems perhaps there is really nothing wrong with VoIP but a more general streaming problem.
Is this Verizon FIOS? If so may be better to have mods move it to FIOS forum.
/tom |
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Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC
·North State Commun..
| said by tschmidt :SIP is just for setup and teardown. Actual stream is direct. Since you are having other steaming problems perhaps there is really nothing wrong with VoIP but a more general streaming problem. Is this Verizon FIOS? If so may be better to have mods move it to FIOS forum. /tom Unfortunately not. It's a regional ILEC called North State Communications. It's all BPON gear though, so it's very similar to FiOS.
And you're right, it seems like an RTP problem to me now. I've been able to finagle and cajole SIP to work on their 212.x subnet (but I still can't get it to work on the 74.x network at all), but no RTP packets pass.
This is really frustrating. They tried to brush me off yesterday and say, "Well, if you have internet access there's nothing else we can do." Argh! |
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Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC
·North State Commun..
1 edit | Plot thickens.
I took the cover off the ONT to get the model number (ZNID-GPON-4213-EL) and noticed a few things.
1) It's a GPON ONT.
2) It (get this) supports VoIP and BOTH VoIP "off-hook" LEDs are illuminated green.
3) It has SIP/RTP ALGs (Application Layer Gateways) built-in
Here is the ONT: »www.zhone.com/products/ZNID-GPON/
That thing has to have some type of SIP/RTP ALG enabled that shouldn't be.
(Edit)
Success! I pushed and pushed and finally spoke to a network engineer. He knew exactly what I was referring to and hinted that the ZNIDs do have VoIP issues (he asked specifically if I was using Vonage) and said the ALGs are probably at fault. He's going to send a tech out so he can work directly with the tech on-site.
Man I hope this is it. |
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
·Hollis Hosting
·Verizon Online DSL
·Fairpoint Communic..
| GPON does a lot of neat stuff compared to APON/BPON. Besides raw increase in speed does away with ATM. Data sheet is interesting in that it looks like POTS emulation is being done as VoIP. With BPON POTS was carried by reserved ATM virtual circuit - similar to having Telco install Remote Terminal.
My guess is that NAT is active in one-to-one mode as opposed to typical residential one-to-many. So effect is to modify port addresses (NAPT) not IP address to "sneak" in VoIP, and perhaps other stuff, without "consuming" another public IP.
quote:
NAT
- NAT-NAPT
- Application Level Gateway (ALGs) modules
- Port triggering
- STUN pass through
Voice Support
- SIP
- SIP PLAR
- Codec Support: G.711, G.723, G.726, G.729
- T.38 support for fax
- VAD, Silence suppression, comfort noise
generation
- Major CLASS features supported
- RTP/RTCP
- SDP
- RTP payload for DTMF digits
- 5 REN per port
- VoIP QoS:
-Layer 3 QoS: control ToS and DSCP for VoIP
- RTP:
- Prioritization of voice over data
»www.zhone.com/products/ZNID-GPON···GPON.pdf
Should be an interesting troubleshooting session.
/tom |
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Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC
·North State Commun..
| said by tschmidt :Should be an interesting troubleshooting session. /tom That's definitely one way of putting it! Although I'd probably choose a different adjective. 
You know, when the guy originally replaced my ONT he kept picking up my IP phone to see if it was working. That confused me and I had to tell him 2 or 3 times that it wasn't their phone. I didn't think anything about it at the time, but I bet he enabled VoIP stuff thinking my VoIP phone was provided by them. When he finally understood he said, "Oh, we don't provide you phone service?"
I bet he didn't turn off the VoIP stuff he enabled because I was running my VoIP phone across a backup Road Runner connection that I installed right before he fixed my North State connection. I bet he thought it was running across the North State connection and everything was fine ...
Cool info about BPON vs. GPON too. I didn't know there was such drastic differences; I just assumed GPON had a higher node speed. |
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Matt
Gone playing Dragon Age Origins
Premium
join:2003-07-20
Jamestown, NC | reply to Matt
Update:
It was an ONT problem. They replaced the ONT and it resolved the issues. The tech found a bare wire that was grounding out on the ONT ... that is probably what killed my last one and caused the issues with this one. |
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
·Hollis Hosting
·Verizon Online DSL
·Fairpoint Communic..
| Glad you got it fixed but it with all that fancy technology also seems almost anticlimactic to be a bad wire. 
Made me think of this Star Trek quote:
quote:
James T. Kirk: Scotty, as good as your word.
Montgomery Scott: Aye, sir. The more they overthink the plumbing, the easier it is to stop up the drain. Here, Doctor, souvenirs from one surgeon to another. I took them out of her main transwarp computer drive.
»en.wikiquote.org/wiki/Star_Trek_···or_Spock
/tom |
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