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T42S Inbound Call Issue
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rtang Offline
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Posts: 3
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Post: #1
T42S Inbound Call Issue
Hi Guys

I am working on a rate issue at the client today.

Issue:
One of the phones failed to receive inbound calls randomly. To look into it further, I've done a Pcap on the SIP server end to see how that phone behave. The result indicated the SIP server is sending call invites to all 5 phones. And, only the problematic phone responses to the invite with "SIP 302 moved temporarily" whereas the other 4 phones responses with "SIP 180 Ringing".

Here are the spec and setup:
> 5 x T42S (Firmware: 29.88.0.90)
> DND: disabled
> Busy call forward: disabled
> Always call forward: disabled
> Local Directory: 14 pages with approx 145 entries
> All phones are connected to the same VoIP Service, internet connection and local switch

Attempted Solution:
-> Firmware update (Failed to address issue)
-> Factory reset (Failed to address issue)
-> Change the local network port and cable for the connection (Failed to address issue)
-> Checked local directory - blacklist (It is already empty)
-> Deleted all entries in the local directory (It addressed the issue)

Any idea what is the possible cause and fix for this issue, if the customer still want to use the Local Directory?

Thanks!

Roy
12-20-2019 04:57 AM
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complex1 Offline
3CX Adv. Cert. Engineer
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Posts: 1,341
Joined: Jan 2014
Reputation: 39
Post: #2
RE: T42S Inbound Call Issue
(12-20-2019 04:57 AM)rtang Wrote:  Hi Guys

I am working on a rate issue at the client today.

Issue:
One of the phones failed to receive inbound calls randomly. To look into it further, I've done a Pcap on the SIP server end to see how that phone behave. The result indicated the SIP server is sending call invites to all 5 phones. And, only the problematic phone responses to the invite with "SIP 302 moved temporarily" whereas the other 4 phones responses with "SIP 180 Ringing".

Here are the spec and setup:
> 5 x T42S (Firmware: 29.88.0.90)
> DND: disabled
> Busy call forward: disabled
> Always call forward: disabled
> Local Directory: 14 pages with approx 145 entries
> All phones are connected to the same VoIP Service, internet connection and local switch

Attempted Solution:
-> Firmware update (Failed to address issue)
-> Factory reset (Failed to address issue)
-> Change the local network port and cable for the connection (Failed to address issue)
-> Checked local directory - blacklist (It is already empty)
-> Deleted all entries in the local directory (It addressed the issue)

Any idea what is the possible cause and fix for this issue, if the customer still want to use the Local Directory?

Thanks!

Roy

Hi Roy,

Firmware 29.88.0.90 isn't native Yealink firmware, I guess.
Also this is firmware for a T42G, not T42S.
What I want to suggest is to flash the phones with the latest firmware and try again.
You can download the latest firmware from here:
http://support.yealink.com/documentFront...umentId=11

Hope this will help.

Kind regards,
Frank.

I am not an employee of Yealink.
Dutch is my native language, not English. Apologies for my imperfect grammar.
Please do not send unsolicited PM messages. I will not answer them.
12-20-2019 12:33 PM
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Yisroel_MongoTEL Offline
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Posts: 225
Joined: Jul 2017
Reputation: 9
Post: #3
RE: T42S Inbound Call Issue
As complex1 wrote, first clarify the model and have the normal latest Yealink firmware installed.

But when looking at the SIP PCAP Capture what are the details (destination and reason) in the Diversion header of the 302 message? You should be able to get a clue from their what settings it might be.
12-20-2019 06:34 PM
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Babylonia Offline
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Posts: 39
Joined: Jun 2019
Reputation: 0
Post: #4
RE: T42S Inbound Call Issue
(12-20-2019 04:57 AM)rtang Wrote:  -> Deleted all entries in the local directory (It addressed the issue)

Any idea what is the possible cause and fix for this issue,
if the customer still want to use the Local Directory?

Did you try to import a "fresh" list of telephone entries.
And do you have the problem again for inbound calls ?

Could be that the original Directory list of entries do have corrupted data?
12-22-2019 05:45 AM
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Yisroel_MongoTEL Offline
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Posts: 225
Joined: Jul 2017
Reputation: 9
Post: #5
RE: T42S Inbound Call Issue
(12-20-2019 04:57 AM)rtang Wrote:  -> Checked local directory - blacklist (It is already empty)
-> Deleted all entries in the local directory (It addressed the issue)
Oops, I missed this....

I think it is obvious that it is a "Auto Divert" setting in the Local Directory. Auto Divert is meant to "Forward" calls from this contact when they call to a different destination.

The issue occurs usually when importing a directory file and not going through all the columns while doing the import, and the "Auto Divert" column gets filled in by one of the other columns in the file.
12-22-2019 07:36 PM
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