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Wron Caller ID showing after internal Transfer

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Hi Guys

 

I have a problem with our new snomone appliance. We use version 5.1.2 of Snomone with SPA941 and Snom 320 phones. External calls show the right caller ID, but if we transfer the call, the caller id of the internal number is on the display. is it possible, that the external caller id shows after transfering?

 

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On which device do you have the problem? If the problem is on the SPA, it might be a challenge because SIP has no real standard way of updating the caller-ID.

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i have it on all of the phones, external -> snom -> snom or external -> snom -> spa or external -> spa -> spa

the main use case would be external -> snom -> spa

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So i updated the PBX too, and the result is bad. No change at all. I understand, that the spa phones are really bad and not from snom. but whats with the snom phones? they should work with the snomone pbx i think. i tried external -> snom -> snom

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whats the solution if one only uses snom phones? i understand, that there is no "standard", but the snom phones and the pbx will have a standard way, or not?

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If your phone has still the old call logs, it could be that it matches the old SIP URI and then overrides the display-name provided by the PBX. If you can reproduce the problem, try to factory reset one of the phones that has the problem and see if that clears the history and solves the problem.

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The Caller-ID topic is unsatisfactory in SIP. Originally the idea was that the phone shows the From-Header. However because it is not allowed to change that header during a conversation (at least not in the beginning), the companies started to do workarounds with Remote-Party-ID, P-Asserted-Identiy and INFO messages with sipfrag attachments. Unfortunately if you got it working with one phone type, it does not work with the next type. We have it on our to-do list to try another approach like now; however honestly this will not guarantee satisfaction.

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