I have the following situation:
SIP Provider -> My asterisk -> SPA2102.
Time to time I recieve a lot of warnings on asterisk CLI with RTP Read too
short, after T.38 session established.
It hapens only in one direction when fax trasmited from provider to SPA2102.
I noticed, that asterisk did not pases one packet, that i include below.
Asterisk reports warning , and drops that frame instead of passing it to SPA
adapter.
Asterisk version 1.4.10.1
No. Time Source Destination Protocol
Info
1021 43.015431 80.80.80.80 90.90.90.90 T.38 UDP:
UDPTLPacket Seq=00001 t30ind: cng
Frame 1021 (60 bytes on wire, 60 bytes captured)
Arrival Time: Sep 19, 2007 07:31:23.630092000
Time delta from previous packet: 0.499966000 seconds
Time since reference or first frame: 43.015431000 seconds
Frame Number: 1021
Packet Length: 60 bytes
Capture Length: 60 bytes
Protocols in frame: eth:ip:udp:t38
Coloring Rule Name: UDP
Coloring Rule String: udp
Ethernet II, Src: Intel_c4:22:40 (00:04:23:c4:22:40), Dst: 00:19:db:34:aa:0f
(00:19:db:34:aa:0f)
Destination: 00:19:db:34:aa:0f (00:19:db:34:aa:0f)
Address: 00:19:db:34:aa:0f (00:19:db:34:aa:0f)
.... ...0 .... .... .... .... = Multicast: This is a UNICAST frame
.... ..0. .... .... .... .... = Locally Administrated Address: This
is a FACTORY DEFAULT address
Source: Intel_c4:22:40 (00:04:23:c4:22:40)
Address: Intel_c4:22:40 (00:04:23:c4:22:40)
.... ...0 .... .... .... .... = Multicast: This is a UNICAST frame
.... ..0. .... .... .... .... = Locally Administrated Address: This
is a FACTORY DEFAULT address
Type: IP (0x0800)
Trailer: 00000000000000000000
Internet Protocol, Src: 80.80.80.80 (80.80.80.80), Dst: 90.90.90.90
(90.90.90.90)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x34 (DSCP 0x0d: Unknown DSCP; ECN: 0x00)
0011 01.. = Differentiated Services Codepoint: Unknown (0x0d)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 36
Identification: 0x49c4 (18884)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 61
Protocol: UDP (0x11)
Header checksum: 0xffde [correct]
Good: True
Bad : False
Source: 80.80.80.80 (80.80.80.80)
Destination: 90.90.90.90 (90.90.90.90)
User Datagram Protocol, Src Port: 35550 (35550), Dst Port: 12166 (12166)
Source port: 35550 (35550)
Destination port: 12166 (12166)
Length: 16
Checksum: 0x0f73 [correct]
ITU-T Recommendation T.38
Stream setup by SDP (frame 760)
Stream frame: 760
Stream Method: SDP
UDPTLPacket
Sequence number: 1
IFPPacket
Type of msg: t30-indicator (0)
T30 indicator: cng (1)
Error recovery: secondary-ifp-packets (0)
Secondary IFPPackets
Item 0
IFPPacket
Type of msg: t30-indicator (0)
T30 indicator: no-signal (0)
