System is on 9.0.8 or something around there. Embedded VM. PRI provider claims the line is good without issues. Client is reporting static on VM messages and during some live calls. Phones are 1416 digital sets with some 9608 IP phones. Is the system itself even capable of having static issues? It's 100% digital right?
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Static on some calls and voicemails with T1 PRI 1
- Thread starter jayjr1105
- Start date
teletechman
Technical User
Also make sure the system is grounded I have had issues with an un-grounded system
Mike
Mike
Joe is correct
line providers always say no issue
the truth is all they can test remotely is is the circuit in service or not they cannot test for noise on the line
Unfortunately you will need to put an isdn30 tester on the circuit to prove (at which point you do have the option to charge after all the line provider will be threatening to charge if they attend & the issue is not theirs)
Do things on the cheap & it will cost you dear
line providers always say no issue
the truth is all they can test remotely is is the circuit in service or not they cannot test for noise on the line
Unfortunately you will need to put an isdn30 tester on the circuit to prove (at which point you do have the option to charge after all the line provider will be threatening to charge if they attend & the issue is not theirs)
Do things on the cheap & it will cost you dear
splittingcodec
Technical User
Jay,
I'll agree with the above comments that the telco provider very well may be the responsible party here, while giving some further advice.
In regards to your question - can this system even have static - I would say yes. You may want to look into the system > Codecs tab and make sure that you're not trying to pass either G.711 ALAW or G.723.1 over the system. With static on the VM's in Embedded Voicemail mode, my gut tells me that a hardware issue is more than worth investigating.Mixing the digital 1400 series sets with the 9600 series IP Telsets could cause some QoS Issues from what I've seen, so I'd want to make sure that the codecs are straight.
Aside from that, the above suggestions to ground the system and to also test a phone plugged directly into the termination are a sound starting point. In my experience, issues like this are the toughest to pin down, but can be resolved via the process of elimination to isolate the trouble and execute on a resolution
I'll agree with the above comments that the telco provider very well may be the responsible party here, while giving some further advice.
In regards to your question - can this system even have static - I would say yes. You may want to look into the system > Codecs tab and make sure that you're not trying to pass either G.711 ALAW or G.723.1 over the system. With static on the VM's in Embedded Voicemail mode, my gut tells me that a hardware issue is more than worth investigating.Mixing the digital 1400 series sets with the 9600 series IP Telsets could cause some QoS Issues from what I've seen, so I'd want to make sure that the codecs are straight.
Aside from that, the above suggestions to ground the system and to also test a phone plugged directly into the termination are a sound starting point. In my experience, issues like this are the toughest to pin down, but can be resolved via the process of elimination to isolate the trouble and execute on a resolution
- Thread starter
- #6
splittingcodec
Technical User
You won't be able to connect directly to the PRI, per se, but you can connect one of the 1400 series phone directly to a digital port on the IPO, weather it be a combo card, digital station card, or expansion module that you're using. That would help to eliminate the possibility of shoddy cabling/wiring in the building causing the trouble, and give you an unhindered connection to the phone system to further trace the root of the trouble
- Thread starter
- #8
This building was fully renovated and rewired last winter. How would wiring come into play with static on VM's though? It's also very intermittent, it doesn't happen a ton. They have forwarded me the wav files with static on them. I'll see if I can dig one up that isn't invasive to the client's client.
- Thread starter
- #9
splittingcodec
Technical User
Listened to that WAV file and wow! That's some heavy static. I would lean heavily towards the phone system being the trouble here. Have you done the following yet?
Power Cycle the whole system outside of production hours
While powered down, re-seat each card component of the IPO
Ground the system
Power Cycle the whole system outside of production hours
While powered down, re-seat each card component of the IPO
Ground the system
- Thread starter
- #11
I typically ground all my systems with 14awg to the nearest electrical panel/box. I haven't had my eyes on this one in a while so I'll have to check. Yes, I've done a full power cycle. I will schedule an after hours visit to try all of the above mentioned things. Thanks guys!
VoIP Numpty
Technical User
That is horrid. Typical cause of crackling like that is clock slip, but I've never heard it that bad...
Are there any alarms on the system?
Are there any alarms on the system?
- Thread starter
- #14
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- #16
Thanks. I'll schedule that after my visit tomorrow evening. I'm going to power the system down, re-seat all cards, run a new ground to the electrical panel, and tweak some codec settings mentioned above. After all that, if they are still seeing the static, I'll push the telco pretty hard.
- Thread starter
- #17
So, ran a dedicated ground to the electrical panel, powered down system, removed all the cards, re-installed, removed codec's not in use. Client reported today that just about every 3 or 4 calls the static is terrible. My company does keep emergency spare chassis and cards. Would it be worth replacing the chassis, and some cards to completely rule out an issue on our end?
Also, I have about 30 feet of cat5e running from the PRI demarc to the phone system. I know some people scoff at non shielded wire for PRI trunks. However I never had a problem with plain cat5 before for PRI's. Yes I have them terminated with the RJ48C standard.
Also, I have about 30 feet of cat5e running from the PRI demarc to the phone system. I know some people scoff at non shielded wire for PRI trunks. However I never had a problem with plain cat5 before for PRI's. Yes I have them terminated with the RJ48C standard.
Telecomboy
Programmer
It's the provider, but I've replaced clients systems with our spare equipment so they can see it is not the equipment as the provider is always very persuasive in telling the client it is the equipment. And sometimes that is the only way to get them to finally send a tech out to fix the issue.
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- #19
teletechman
Technical User
The way we test is to take a spare system and afterhours plug in a phone and the PRI no other equipment and make a few test calls to see if you get the static. If you do I would ask for a vendor meet with the provider and have them test this while in front of you. I have had a number of time that the provider tested ok but that was not to the building or the smart jack. Also what type of PRI are you dealing with is it a standard wired PRI or a SIP enabled PRI?
Mike
Mike
- Thread starter
- #20
Just to update. We've replaced the chassis and all cards, grounded the system (better than what it was), replaced the cable from the PRI jack to the system, telco came out and actually gave the issue some attention and troubleshot things for a while. They ended up changing the pairs on the telephone pole in which the PRI was residing on. Guess what guys... still static. Could it be something with the SD card itself? It's technically the only thing we haven't replaced yet besides the phones, but it's happening on digital phones, and IP phones, and happening to voicemail as well (ruling out phones).
I have a spare Cisco UC560 phone system that accepts a PRI, I might take it in there after hours, keep it completely separate and see if I can reproduce the issue. Fortunately the client is very understanding and realizes we did just about all we can do. I'm soon going to pull my hair out on this one guys.
I have a spare Cisco UC560 phone system that accepts a PRI, I might take it in there after hours, keep it completely separate and see if I can reproduce the issue. Fortunately the client is very understanding and realizes we did just about all we can do. I'm soon going to pull my hair out on this one guys.
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