Author Topic: External caller does not hear ringing when Mitel phone is forwarded  (Read 2814 times)

Offline miked1428

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When an external caller calls someone that has their phone forwarded they do not hear ringing even though the destination phone is ringing. For example, I forward my mitel phone to my cell phone and when someone outside calls my DiD they do not hear ringing but the destination cell phone rings. If I try calling the forwarded phone from another mitel phone I can hear ringing. It seems to be a trunk COS, but I can't figure it out. 


Offline sarond

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #1 on: November 22, 2016, 08:55:05 PM »
What type of trunks do you have?
Sounds like a SIP issues.

Offline petr.necas

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #2 on: November 23, 2016, 01:25:40 AM »
hi miked1428,
if the trunk is SIP trunk, try to set the option "Disable Reliable Provisional Responses" to Yes in the SIP peer profile.

Offline miked1428

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #3 on: November 23, 2016, 10:24:44 AM »
We have a device that converts the trunk from SIP to PRI, so it's not a true SIP trunk. If I change the COS setting "Suppress Simulated CCM after ISDN Progress" from NO to YES for my IP trunk I can reproduce the issue where the caller on a mitel phone does not hear ringing. When its set back to NO the caller hears ringing again. I have tried adjusting this setting to NO for the PRI and SIP trunk COS but it does not seem to make a difference.

Offline petr.necas

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #4 on: November 23, 2016, 10:34:20 AM »
I'm confused, do you have any SIP trunk configured in SIP Peer Profile or not?

Offline miked1428

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #5 on: November 23, 2016, 10:39:54 AM »
The only SIP trunk we have configured is for our conferencing server. It is a PRI trunk.
« Last Edit: November 23, 2016, 10:41:34 AM by miked1428 »

Offline sarond

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Re: External caller does not hear ringing when Mitel phone is forwarded
« Reply #6 on: November 23, 2016, 09:56:10 PM »
I would raise this with your provider/carrier.
It could be an issue on their end.


 

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