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Cellular Phone Forum / Providers / Cingular / September 2005Voice Mail problem on Cell phones
My users complain about getting voice mails on their cell phones and the phones did not ring at all. They have to deligently check voice mail on a regular basis even they did not get a notification on the cell phone. Does anyone know why this is happening? Is Cingular going thru some network changes which cause this problem? etang_sf@yahoo.com wrote in news:1125686052.189606.25040 @g49g2000cwa.googlegroups.com: > My users complain about getting voice mails on their cell phones and > the phones did not ring at all. They have to deligently check voice > mail on a regular basis even they did not get a notification on the > cell phone. Does anyone know why this is happening? Is Cingular going > thru some network changes which cause this problem? My girlfriend and I both experienced this exact problem. There was only one instance of this happening to either of us and that was about two weeks ago. Yesterday we both experienced problems dialing out because of "network busy" issues. Whether these are due to network changes is probably doubtful. These two items were unsual, compared to the usual dropped calls and spotty connections that is our GSM service in S.W. FL. If someone calls you and their isn't a cell channel available in your area on a nearby tower, they can't pass the call to you so it goes right to voice mail, or any other number it is set to forward to. Same thing happens when driving. You need to have a handoff from one tower to the next, but the next one is 100% busy, there goes the call.  SignatureSteve > etang_sf@yahoo.com wrote in news:1125686052.189606.25040 > @g49g2000cwa.googlegroups.com: [quoted text clipped - 15 lines] > These two items were unsual, compared to the usual dropped calls and > spotty connections that is our GSM service in S.W. FL. > My users complain about getting voice mails on their cell phones and > the phones did not ring at all. They have to deligently check voice > mail on a regular basis even they did not get a notification on the > cell phone. Does anyone know why this is happening? Is Cingular going > thru some network changes which cause this problem? While in the gym, I drop my Razr into the car console among credit cards with mag stripes, screwdriver, pocket knife, auto adapters for cell, pocket browser, GPS, etc. That creates a cellular Pandora's box. Calls will roll to voicemail because of no signal. > My users complain about getting voice mails on their cell phones and > the phones did not ring at all. They have to deligently check voice > mail on a regular basis even they did not get a notification on the > cell phone. Does anyone know why this is happening? Is Cingular going > thru some network changes which cause this problem? Actually - this problem is caused because the tower that you were connected to previously has "forgotten" that you are still connected to it. This can be common to people who live/work next to high usage areas like freeways. The solution is very simple. Have your users power the phone off - wait a minute and power back on. This reregisters the phone on the tower and calls begin to come through again. >>My users complain about getting voice mails on their cell phones and >>the phones did not ring at all. They have to deligently check voice [quoted text clipped - 5 lines] > to previously has "forgotten" that you are still connected to it. This can > be common to people who live/work next to high usage areas like freeways. Wouldn't this problem be mitigated by the fact that all cell phones, from AMPS to TDMA to GSM to CDMA, periodically transmit a registration ping to the cell site to say "I'm still here?" It would seem more likely to me that instead of the cell site "forgetting" about a cell phone that is homed on it, it would instead be at capacity, and simply doesn't have another time slot available to assign to that phone to handle yet another call. > The solution is very simple. Have your users power the phone off - wait a > minute and power back on. This reregisters the phone on the tower and calls > begin to come through again. It would seem rather cumbersome to have to do this multiple times a day every time a cell site "forgets" about a phone, wouldn't you say? that's what periodic re-registration is for. SignatureE-mail fudged to thwart spammers. Transpose the c's and a's in my e-mail address to reply. > >>My users complain about getting voice mails on their cell phones and > >>the phones did not ring at all. They have to deligently check voice [quoted text clipped - 22 lines] > every time a cell site "forgets" about a phone, wouldn't you say? > that's what periodic re-registration is for. You are correct in as much as I was not explicit enough to say that when a tower "forgets" the reason it forgets is that the tower that one is connected to is indeed at capacity and registration is lost. > >>My users complain about getting voice mails on their cell phones and > >>the phones did not ring at all. They have to deligently check voice [quoted text clipped - 22 lines] > every time a cell site "forgets" about a phone, wouldn't you say? > that's what periodic re-registration is for. My bad - I didn't read through the entire email. If you are in your own home calling area and except for when you are using data - a phone will not send out pings to the tower to maintain connection. A tower may send out a signal to see if you are still on it - but if you have already dropped then it would not see you. >> >>My users complain about getting voice mails on their cell phones and >> >>the phones did not ring at all. They have to deligently check voice >> >>mail on a regular basis even they did not get a notification on the >> >>cell phone. Does anyone know why this is happening? Is Cingular going >> >>thru some network changes which cause this problem? This is probably due to network disruption. Report the problem, and keep reporting it until it gets fixed. >> > Actually - this problem is caused because the tower that you were connected >> > to previously has "forgotten" that you are still connected to it. This can >> > be common to people who live/work next to high usage areas like freeways. It's actually a relatively rare occurrence. GSM handset location is managed by the Home Location Register (HLR), and the Visitor Location Register (VLR), commonly one per MSC (Mobile services Switching Center), which can handle multiple BSCs (Base Station Controllers), each of which can handle multiple BTSs (Base Transceiver Stations, aka "towers"). The MSC is part of the GSM Network Subsystem, not the GSM Base Station Subsystem. >> Wouldn't this problem be mitigated by the fact that all cell phones, >> from AMPS to TDMA to GSM to CDMA, periodically transmit a registration >> ping to the cell site to say "I'm still here?" Yes. >> It would seem more likely to me that instead of the cell site >> "forgetting" about a cell phone that is homed on it, it would instead be >> at capacity, and simply doesn't have another time slot available to >> assign to that phone to handle yet another call. Registration isn't affected by capacity -- handsets stay registered even if a cell is operating at capacity. >> > The solution is very simple. Have your users power the phone off - wait a >> > minute and power back on. This reregisters the phone on the tower and calls >> > begin to come through again. GSM handsets are programmed to register themselves periodically -- no manual intervention of special command is necessary. >> It would seem rather cumbersome to have to do this multiple times a day >> every time a cell site "forgets" about a phone, wouldn't you say? >> that's what periodic re-registration is for. Correct. >My bad - I didn't read through the entire email. If you are in your own >home calling area and except for when you are using data - a phone will not >send out pings to the tower to maintain connection. A tower may send out a >signal to see if you are still on it - but if you have already dropped then >it would not see you. Again, GSM handsets are programmed to register themselves periodically -- no manual intervention of special command is necessary. For more information, see "Overview of the Global System for Mobile Communications" at <http://ccnga.uwaterloo.ca/~jscouria/GSM/gsmreport.html>. SignatureBest regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES: John Navas <http://navasgrp.home.att.net/#Cingular> >>My users complain about getting voice mails on their cell phones and >>the phones did not ring at all. They have to deligently check voice [quoted text clipped - 9 lines] > minute and power back on. This reregisters the phone on the tower and calls > begin to come through again. Which phone are you seeing this happen on? Maybe it is defective. Is it possible that it is being used in a weak signal area and the calls didn't ring through due to being out of coverage? |
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