Hi -
Can someone recommend a good smartphone for testing with OsmoSGSN? We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
Better yet, is there anything out there that can generate an L2 or L3 trace, like the Nokia 3310, but for GPRS as well as GSM?
-- David
Hi David,
On Tue, Dec 13, 2011 at 09:37:19PM -0800, David A. Burgess wrote:
Can someone recommend a good smartphone for testing with OsmoSGSN? We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
I've successfully used at least SE K800i, Google Nexus S, Dell Streak, HTC Hermes II, Motorola A780 here on my side. I know some other people have been using OsmoSGSN/OpenGGSN for iPhone related work, though I don't know which particular model they've used.
Better yet, is there anything out there that can generate an L2 or L3 trace, like the Nokia 3310, but for GPRS as well as GSM?
The only ones that come to my mind are the TEMS variants of the K800i, but those are of course hard to come by and/or expensive :/
Have you considered using Luca's work on gprsdecode? This way you could do an air interface trace of what's happening between BTS and MS.
Regards, Harald
Harald -
Thanks for the list. We'll try to find one of these. I have a few iPhones sitting in front of me, but unfortunately they are all 850/1900 and my available hardware is 900. :(
Does you have an example GSMTAP/PCAP trace of a successful PDP context activation using OmsoSGSN? That would be useful for comparison. (And do you find the GPRS L3 & SNDCP decoding in the current Wireshark 1.7 to be reliable?)
-- David
On Dec 14, 2011, at 1:36 AM, Harald Welte wrote:
Hi David,
On Tue, Dec 13, 2011 at 09:37:19PM -0800, David A. Burgess wrote:
Can someone recommend a good smartphone for testing with OsmoSGSN? We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
I've successfully used at least SE K800i, Google Nexus S, Dell Streak, HTC Hermes II, Motorola A780 here on my side. I know some other people have been using OsmoSGSN/OpenGGSN for iPhone related work, though I don't know which particular model they've used.
Better yet, is there anything out there that can generate an L2 or L3 trace, like the Nokia 3310, but for GPRS as well as GSM?
The only ones that come to my mind are the TEMS variants of the K800i, but those are of course hard to come by and/or expensive :/
Have you considered using Luca's work on gprsdecode? This way you could do an air interface trace of what's happening between BTS and MS.
Regards, Harald --
- Harald Welte laforge@gnumonks.org http://laforge.gnumonks.org/
============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
Hi David,
adding to Haralds list, I can confirm that the Nokia E71 also works.
-Tobias
On 14.12.2011 19:05, David A. Burgess wrote:
Harald -
Thanks for the list. We'll try to find one of these. I have a few iPhones sitting in front of me, but unfortunately they are all 850/1900 and my available hardware is 900. :(
Does you have an example GSMTAP/PCAP trace of a successful PDP context activation using OmsoSGSN? That would be useful for comparison. (And do you find the GPRS L3 & SNDCP decoding in the current Wireshark 1.7 to be reliable?)
-- David
On Dec 14, 2011, at 1:36 AM, Harald Welte wrote:
Hi David,
On Tue, Dec 13, 2011 at 09:37:19PM -0800, David A. Burgess wrote:
Can someone recommend a good smartphone for testing with OsmoSGSN? We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
I've successfully used at least SE K800i, Google Nexus S, Dell Streak, HTC Hermes II, Motorola A780 here on my side. I know some other people have been using OsmoSGSN/OpenGGSN for iPhone related work, though I don't know which particular model they've used.
Better yet, is there anything out there that can generate an L2 or L3 trace, like the Nokia 3310, but for GPRS as well as GSM?
The only ones that come to my mind are the TEMS variants of the K800i, but those are of course hard to come by and/or expensive :/
Have you considered using Luca's work on gprsdecode? This way you could do an air interface trace of what's happening between BTS and MS.
Regards, Harald --
- Harald Welte laforge@gnumonks.org http://laforge.gnumonks.org/
============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
I can add the following phones to the list
Apple iPhone 4 Apple iPhone 3GS
Samsung Omnia II Samsung Galaxy S II Samsung SGH-i780
HTC touch Diamond
Envoyé de mon iPhone
Le Dec 15, 2011 à 4:35 AM, Tobias Engel t-openbsc@tobias.org a écrit :
Hi David,
adding to Haralds list, I can confirm that the Nokia E71 also works.
-Tobias
On 14.12.2011 19:05, David A. Burgess wrote:
Harald -
Thanks for the list. We'll try to find one of these. I have a few iPhones sitting in front of me, but unfortunately they are all 850/1900 and my available hardware is 900. :(
Does you have an example GSMTAP/PCAP trace of a successful PDP context activation using OmsoSGSN? That would be useful for comparison. (And do you find the GPRS L3 & SNDCP decoding in the current Wireshark 1.7 to be reliable?)
-- David
On Dec 14, 2011, at 1:36 AM, Harald Welte wrote:
Hi David,
On Tue, Dec 13, 2011 at 09:37:19PM -0800, David A. Burgess wrote:
Can someone recommend a good smartphone for testing with OsmoSGSN? We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
I've successfully used at least SE K800i, Google Nexus S, Dell Streak, HTC Hermes II, Motorola A780 here on my side. I know some other people have been using OsmoSGSN/OpenGGSN for iPhone related work, though I don't know which particular model they've used.
Better yet, is there anything out there that can generate an L2 or L3 trace, like the Nokia 3310, but for GPRS as well as GSM?
The only ones that come to my mind are the TEMS variants of the K800i, but those are of course hard to come by and/or expensive :/
Have you considered using Luca's work on gprsdecode? This way you could do an air interface trace of what's happening between BTS and MS.
Regards, Harald --
- Harald Welte laforge@gnumonks.org http://laforge.gnumonks.org/
============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6)
Hi David,
On Wed, Dec 14, 2011 at 10:05:31AM -0800, David A. Burgess wrote:
Does you have an example GSMTAP/PCAP trace of a successful PDP context activation using OmsoSGSN? That would be useful for comparison. (And do you find the GPRS L3 & SNDCP decoding in the current Wireshark 1.7 to be reliable?)
I currently don't think I have any traces ready that I could share with you, but there might be some other people on this list who have.
In any case, if you are already getting beyound the GMM procedures (RA UPDATE / GPRS ATTACH) in bi-directional communication between the MS and the SGSN, then I think your L1 and RLC/MAC are working.
I guess the problem might really be the PDP CONTEXT ACTIVATE then.
I would look in the PCAP files for * issues with using the wrong TLLI, especially during/after P-TMSI reallocation (maybe patch out the code from OsmoSGSN) * sequence numbering issues on the LLC layer sequence numbers
And yes, so far I havent' had much complaints about the GMM/SM/SNDCP/LLC decoding of wireshark.
Regards, Harald
Hello
We are having trouble getting our GPRS modem to recognize a ACTIVATE PDP CONTEXT ACK message and are trying to determine if the error is in the modem, in OmsoSGSN or somewhere in between.
Probably in OsmoSGSN as I have exactly the same problem with several phones. Those that work more often than others are Nokia 6230i (not a smartphone) and HTC TyTN (smartphone, but an older one).
Regards, Radko Krkoš
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David A. Burgess -
Harald Welte -
Radko Krkoš -
Seungju Kim -
Tobias Engel