[asterisk-users] Asterisk doesn't like OpenBTS!!!

A.H. Jos
Thu, 21 Jul 2011 09:05:52 -0000

HI list,
I have succeeded to establish calls using OpenBTS/USRP1/Asterisk. but the
problem is that my cell phone rings, I get 2 way audio but after a few
seconds the call is dropped. In my asterisk log I see this:

[Jul 18 11:25:48] WARNING[1221]: chan_sip.c:3622 retrans_pkt: Retransmission
timeout reached on transmission 1348333597 at 127.0.0.1 for seqno 94 (Critical
Response) -- See
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions
Packet timed out after 32000ms with no response
[Jul 18 11:25:48] WARNING[1221]: chan_sip.c:3651 retrans_pkt: Hanging up
call 1348333597 at 127.0.0.1 - no reply to our critical packet (see
https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions).

In the SIP Debug, I see always 10 Retransmissions of the same "SIP/2.0 200
Ok" message!!! after that the above "Retransmission timeout"
message is
viewed!!!

Retransmitting #10 (no NAT) to 127.0.0.1:5062:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 127.0.0.1:5062;branch=z9hG4bK53934;received=127.0.0.
1
From: IMSI208012601160193
<sip:IMSIxxxxxx at 127.0.0.1<sip%3AIMSI208012601160193 at
127.0.0.1>
>;tag=lkbdg
To: <sip:2121211 at 127.0.0.1>;tag=as7c57c466
Call-ID: 1348333597 at 127.0.0.1
CSeq: 94 INVITE
Server: Asterisk PBX 1.8.5.0-1digium1~lucid
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
PUBLISH
Supported: replaces, timer
Contact: <sip:2121211 at 127.0.0.1:5060>
Content-Type: application/sdp
Content-Length: 213

I have established only a one call from my hardphone (connected to OpenBTS)
to my twinkle softphone. but after the call is dropped (T == 32 secondes) by
my softphone and after hanging up my hardphone (T == 60 seconds) I have
received automatically a call from my twinkle softphone!!!
In wireshark trace, I see that OpenBTS is trying to ACK the OK from
Asterisk, but Asterisk doesn't like it !!!

I have tried to modify the value of the SIP timers, that works only from a
hardphone to a softphone but not from hard to hard. can some one tell us
what's the definition of t1min and timert1?
t1min=1000
timert1=5000
timerb=32000

Any help will be appreciated.
A.H. Jos,
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