Phone rings twice before UC500 rings

Answered Question
Jul 10th, 2009
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I am noticing something weird, when I have our business line connected to the UC520 and make a call from an external land line, the exteral call rings twice before the first ring by an ip-phone connected to the UC520. If I plug our business line directly into an old analog phone (not using the UC520) and make the same call from an external line, the first ring is almost instant.


Why is there a 2 ring delay when using the UC520, is this normal?

Correct Answer by David Trad about 7 years 10 months ago

Hi Tervor,


Keep in mind that some carriers may not send the CID untill the second ring, i know that here in Australia most carriers pass it through on the second ring, ocassionaly it may come through on the first ring, but that is rare.


You can do a Debug VPM signal (For PSTN) and or debug ISDN to see when the CID is being passed, this will give you a good indication on how much you can decrease the Ring in timer.



Cheers,



David.

Correct Answer by Marcos Hernandez about 7 years 10 months ago

You need to keep an eye on caller ID showing up on the IP phone. Give it a shot. You can always go back.


Marcos

Correct Answer by Marcos Hernandez about 7 years 10 months ago

This is normal. It takes a ring cycle for the FXO to detect activity and receive caller id (depending on the caller ID type). You can lower this by doing this command:


UC500(config)#voice-port 0/1/0
UC500(config-voiceport)#ring number ?
  <1-10>  The number of rings detected before closing loop


Remember to do a "shutdown", followed by a "no shutdown" after changes made to your voice ports.


Thanks,


Marcos

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Correct Answer
Marcos Hernandez Fri, 07/10/2009 - 14:50
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This is normal. It takes a ring cycle for the FXO to detect activity and receive caller id (depending on the caller ID type). You can lower this by doing this command:


UC500(config)#voice-port 0/1/0
UC500(config-voiceport)#ring number ?
  <1-10>  The number of rings detected before closing loop


Remember to do a "shutdown", followed by a "no shutdown" after changes made to your voice ports.


Thanks,


Marcos

Brikers12 Fri, 07/10/2009 - 15:04
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thanks for the reply. Is there any disadvantage to doing this?

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Marcos Hernandez Fri, 07/10/2009 - 15:05
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You need to keep an eye on caller ID showing up on the IP phone. Give it a shot. You can always go back.


Marcos

Brikers12 Fri, 07/10/2009 - 15:08
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ok I will play around with it. Our caller ID is't setup on our new lines until monday so i'll have to wait.

Correct Answer
David Trad Fri, 07/10/2009 - 20:58
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Hi Tervor,


Keep in mind that some carriers may not send the CID untill the second ring, i know that here in Australia most carriers pass it through on the second ring, ocassionaly it may come through on the first ring, but that is rare.


You can do a Debug VPM signal (For PSTN) and or debug ISDN to see when the CID is being passed, this will give you a good indication on how much you can decrease the Ring in timer.



Cheers,



David.

Brikers12 Wed, 07/15/2009 - 11:17
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I typed the following in the CLI with no errors, but when I search the output of "show running-config" I can't find "ring number" anywhere, so i don't think it applied?


UC500#enable

UC500#conf t

UC500(config)#voice-port 0/1/0
UC500(config-voiceport)#ring number 1

UC500(config-voiceport)#shutdown

UC500(config-voiceport)#no shutdown

UC500(config-voiceport)#exit

UC500(config)#exit

UC500#wr mem


is that the correct way I should make changes?




I also hearch this from my Telco: "On the TELUS network, the Name and number are delivered immediately following the first full ring."

It seems the CallerID on my line still isn`t going to be setup until tommorow, so I can`t fully test when the CID is actually passed.

Marcos Hernandez Wed, 07/15/2009 - 11:19
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This is the correct way. Let us know how it goes.


Marcos

Marcos Hernandez Wed, 07/15/2009 - 11:46
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You can try to do "connection plar XXX immediate" and see what happens. XXX is the destination number (internal). Again, a "shut", "no shut" would be required.


Marcos

Brikers12 Wed, 07/15/2009 - 11:46
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Yes that setting definatly worked, the Cisco ip-phone rings much faster now, right after the first ring on the external end. I will see tommorow how it effects the CallerID, thanks so much for the help with this!

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