Hi,

OK, the SGSN is running and listening/communicating on port 23000 as specified in the config files.  I was confused because (1) I couldn't find the IP address passed to the BTS on the Wireshark packet captures (maybe the IP is sent as binary or not regular text), and (2), it now seems clear the iPhone 3GS won't transmit/support GPRS even though it shows some GPRS data in the GPRS field test modes.  Thus, with the iPhone 3GS, there was no BTS->SGSN traffic to view (even though it has a GPRS test mode).

We are now testing with a GPRS capable phone, the LG GR500.  We can see some initial GPRS data, but nothing more than the following.  The messages represent what is shown upon power up of the phone, and no following GPRS messages are sent by the phone when trying to access IP:

Here is BTS/SGSN startup:

<0011> gprs_ns.c:169 NSVCI=65534 Creating NS-VC

<0011> gprs_ns.c:169 NSVCI=65535 Creating NS-VC

<0011> gprs_ns.c:804 Creating NS-VC for BSS at 192.168.253.10:23000

<0011> gprs_ns.c:677 NSEI=65535 Rx NS RESET (NSVCI=0, cause=O&M intervention)

<0011> gprs_ns.c:536 NSEI=101 Tx NS RESET ACK (NSVCI=101)

<0011> gprs_ns.c:863 NSEI=101 Rx NS UNBLOCK

<0012> gprs_bssgp.c:247 BSSGP BVCI=0 Rx RESET cause=Transmission capacity modified

<0012> gprs_bssgp.c:247 BSSGP BVCI=2 Rx RESET cause=O&M intervention

<0012> gprs_bssgp.c:270 Cell 1-1-1-0 CI 0 on BVCI 2

<0012> gprs_bssgp.c:323 BSSGP BVCI=2 Rx BVC-UNBLOCK

<0012> gprs_bssgp.c:463 BSSGP BVCI=2 Rx Flow Control BVC

Here is the phone powering up:

<0012> gprs_bssgp.c:347 BSSGP TLLI=0x78fd6033 Rx UPLINK-UNITDATA

<0013> gprs_llc.c:478 LLC SAPI=1 C FCS=0x35b15fCMD=UI DATA

<0013> gprs_llc.c:742 LLC RX: unknown TLLI 0x78fd6033, creating LLME on the fly

2nd try:

<0012> gprs_bssgp.c:347 BSSGP TLLI=0x7d3b6971 Rx UPLINK-UNITDATA

<0013> gprs_llc.c:478 LLC SAPI=1 C FCS=0x35b15fCMD=UI DATA

<0013> gprs_llc.c:742 LLC RX: unknown TLLI 0x7d3b6971, creating LLME on the fly

I saw a note on the message board from about a year ago about handling the unknown TLLI with a patch, but the code for gprs_llc.c has been updated quite a bit since then.

We will try to look into it more and report back any findings, but any pointers would be appreciated.

John