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Re: [hylafax-users] T.38 / T.30 handshake problems
- To: hylafax-users@xxxxxxxxxxx
- Subject: Re: [hylafax-users] T.38 / T.30 handshake problems
- From: "Atis Lezdins" <atis@xxxxxxxxxxx>
- Date: Tue, 5 Aug 2008 00:20:54 +0300
On Fri, Aug 1, 2008 at 5:23 PM, Atis Lezdins <atis@xxxxxxxxxxx> wrote:
> Hello,
>
> I've been trying connecting Hylafax+ -> T38modem/OPAL -> Asterisk ->
> VoIP provider -> PRI -> Asterisk -> IAXmodem -> Hylafax. Provider's
> switch claims to support T.38, however i cannot send anything trough
> it.
>
> Connection is established, however if i send fax to regular phone, i
> don't hear any sound. I've debugged this with provider, they sent me
> their wireshark captures. I can see that there is some kind of NAT
> involved, they are doing captures behind it, but that probably should
> be ok. Of course dialing trough with u-law codec works fine.
>
> There is some things that confuse me. In wireshark graph i can see
> that there is sent "ced" , followed by v21 preamble and CSI num,
> however i receive "ced" twice, and then Hylafax/T38modem replays with
> "no signal".
>
> So, is this handshake ok?
>
> Any help or ideas would be appreciated.
>
> Below are logs from Hylafax, and wireshark graphs.
> (Real IP's and phone numbers are masked)
Hi,
I just got reply from provider that they are sending CSI and DIS, but
don't receive any response. I also don't see any response sent in
outgoing packet dump, so seems that Hylafax/T38modem is not sending
that for some reason.
Perhaps there is some good documentation on this (protocol,
handshakes, etc), so i can try to trace/debug Hylafax and T38modem
myself?
Regards,
Atis
>
> Sender (Hylafax log):
> Jul 30 14:37:34.31: [ 4742]: SESSION BEGIN 000000006 14151111111
> Jul 30 14:37:34.31: [ 4742]: HylaFAX (tm) Version 5.2.5
> Jul 30 14:37:34.31: [ 4742]: SEND FAX: JOB 2 DEST 14151111111 COMMID
> 000000006 DEVICE '/dev/ttyT38-1' FROM 'a.lezdinsh
> <a.lezdinsh@xxxxxxxxx>' USER root
> Jul 30 14:37:34.31: [ 4742]: STATE CHANGE: RUNNING -> SENDING
> Jul 30 14:37:34.31: [ 4742]: <-- [12:AT+FCLASS=1\r]
> Jul 30 14:37:34.31: [ 4742]: --> [2:OK]
> Jul 30 14:37:34.32: [ 4742]: DIAL 14151111111
> Jul 30 14:37:34.32: [ 4742]: <-- [16:ATDT14151111111\r]
> Jul 30 14:37:38.91: [ 4742]: --> [7:CONNECT]
> Jul 30 14:37:41.47: [ 4742]: --> HDLC<25:FF C0 02 B6 A6 26 F6 B6 1A 82
> 92 04 04 04 04 04 04 04 04 04 04 04 04 2A 64>
> Jul 30 14:37:41.47: [ 4742]: --> [2:OK]
> Jul 30 14:37:41.47: [ 4742]: REMOTE CSI "IAXmodem"
> Jul 30 14:37:41.47: [ 4742]: <-- [9:AT+FRH=3\r]
> Jul 30 14:37:41.47: [ 4742]: --> [7:CONNECT]
> Jul 30 14:37:41.47: [ 4742]: --> [10:NO CARRIER]
> Jul 30 14:37:41.47: [ 4742]: MODEM No carrier
> Jul 30 14:37:41.47: [ 4742]: <-- [10:AT+FRS=21\r]
> Jul 30 14:37:41.69: [ 4742]: --> [2:OK]
> Jul 30 14:37:41.69: [ 4742]: <-- [9:AT+FTH=3\r]
> Jul 30 14:37:41.69: [ 4742]: --> [7:CONNECT]
> Jul 30 14:37:41.69: [ 4742]: <-- HDLC<3:FF C8 D8>
> Jul 30 14:37:41.69: [ 4742]: <-- data [3]
> Jul 30 14:37:41.69: [ 4742]: <-- data [2]
> Jul 30 14:37:42.79: [ 4742]: --> [2:OK]
> Jul 30 14:37:42.79: [ 4742]: SEND send CRP (command repeat)
> Jul 30 14:37:42.79: [ 4742]: <-- [9:AT+FRH=3\r]
> Jul 30 14:37:45.88: [ 4742]: --> [7:CONNECT]
> Jul 30 14:37:55.88: [ 4742]: MODEM TIMEOUT: receiving HDLC frame data
> Jul 30 14:37:55.88: [ 4742]: <-- data [1]
> Jul 30 14:37:55.88: [ 4742]: --> [2:OK]
> Jul 30 14:37:55.88: [ 4742]: <-- [9:AT+FRS=7\r]
> Jul 30 14:37:55.95: [ 4742]: --> [2:OK]
> Jul 30 14:37:55.95: [ 4742]: <-- [9:AT+FRH=3\r]
> Jul 30 14:38:01.11: [ 4742]: --> [7:CONNECT]
> Jul 30 14:38:11.11: [ 4742]: MODEM TIMEOUT: receiving HDLC frame data
> Jul 30 14:38:11.11: [ 4742]: <-- data [1]
> Jul 30 14:38:11.11: [ 4742]: --> [2:OK]
> Jul 30 14:38:11.11: [ 4742]: <-- [9:AT+FRS=7\r]
> Jul 30 14:38:11.18: [ 4742]: --> [2:OK]
> Jul 30 14:38:11.18: [ 4742]: <-- [9:AT+FRH=3\r]
> Jul 30 14:38:16.35: [ 4742]: --> [7:CONNECT]
> Jul 30 14:38:26.35: [ 4742]: MODEM TIMEOUT: receiving HDLC frame data
> Jul 30 14:38:26.35: [ 4742]: <-- data [1]
> Jul 30 14:38:26.35: [ 4742]: --> [5:ERROR]
> Jul 30 14:38:26.35: [ 4742]: MODEM Command error
> Jul 30 14:38:26.35: [ 4742]: No receiver protocol (T.30 T1 timeout) {E126}
> Jul 30 14:38:26.35: [ 4742]: SEND FAILED: JOB 2 DEST 14151111111 ERR
> No receiver protocol (T.30 T1 timeout) {E126}
> Jul 30 14:38:26.35: [ 4742]: <-- [9:AT+FRS=7\r]
> Jul 30 14:38:26.42: [ 4742]: --> [2:OK]
> Jul 30 14:38:26.42: [ 4742]: <-- [9:AT+FTH=3\r]
> Jul 30 14:38:26.42: [ 4742]: --> [7:CONNECT]
> Jul 30 14:38:26.42: [ 4742]: <-- HDLC<3:FF C8 DF>
> Jul 30 14:38:26.42: [ 4742]: <-- data [3]
> Jul 30 14:38:26.42: [ 4742]: <-- data [2]
> Jul 30 14:38:27.51: [ 4742]: --> [2:OK]
> Jul 30 14:38:27.51: [ 4742]: MODEM input buffering enabled
> Jul 30 14:38:28.51: [ 4742]: <-- [5:ATH0\r]
> Jul 30 14:38:28.62: [ 4742]: --> [2:OK]
> Jul 30 14:38:28.62: [ 4742]: MODEM set DTR OFF
> Jul 30 14:38:28.62: [ 4742]: MODEM set baud rate: 0 baud (flow control
> unchanged)
> Jul 30 14:38:28.62: [ 4742]: STATE CHANGE: SENDING -> MODEMWAIT (timeout 5)
> Jul 30 14:38:28.62: [ 4742]: SESSION END
>
> Sender (Wireshark graph):
>
> |Time | xxx.xxx.xxx.xxx | yyy.yy.yyy.yyy |
> |14,923 | INVITE SDP ( t38) |SIP From:
> sip:8001111111@xxxxxxxxxxxxxxx To:sip:14151111111@xxxxxxxxxxxxxx
> | |(5060) ------------------> (5060) |
> |15,128 | 100 Trying| |SIP Status
> | |(5060) <------------------ (5060) |
> |17,136 | 180 Ringing |SIP Status
> | |(5060) <------------------ (5060) |
> |17,380 | 200 OK SDP ( t38) |SIP Status
> | |(5060) <------------------ (5060) |
> |17,381 | ACK | |SIP Request
> | |(5060) ------------------> (5060) |
> |17,861 | ced | |t38:t30 Ind:ced
> | |(4655) <------------------ (10562) |
> |18,371 | ced | |t38:t30 Ind:ced
> | |(4655) <------------------ (10562) |
> |19,501 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |22,061 | CSI Num: IAXmodem |t38:v21:HDLC:Called
> Subscriber Identification
> | |(4655) <------------------ (10562) |
> |22,282 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) ------------------> (10562) |
> |22,561 | DIS DSR:ITU-T V.27 ter and V.29
> |t38:v21:HDLC:Digital Identification Signal
> | |(4655) <------------------ (10562) |
> |23,414 | no-signal | |t38:t30 Ind:no-signal
> | |(4655) ------------------> (10562) |
> |26,470 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |34,609 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |37,138 | CSI Num: IAXmodem |t38:v21:HDLC:Called
> Subscriber Identification
> | |(4655) <------------------ (10562) |
> |37,628 | DIS DSR:ITU-T V.27 ter and V.29
> |t38:v21:HDLC:Digital Identification Signal
> | |(4655) <------------------ (10562) |
> |41,697 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |49,836 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |52,366 | CSI Num: IAXmodem |t38:v21:HDLC:Called
> Subscriber Identification
> | |(4655) <------------------ (10562) |
> |52,865 | DIS DSR:ITU-T V.27 ter and V.29
> |t38:v21:HDLC:Digital Identification Signal
> | |(4655) <------------------ (10562) |
> |56,935 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |66,403 | ced | |t38:t30 Ind:ced
> | |(4655) <------------------ (10562) |
> |67,006 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) ------------------> (10562) |
> |68,137 | no-signal | |t38:t30 Ind:no-signal
> | |(4655) ------------------> (10562) |
> |69,083 | v21-preamble |t38:t30 Ind:v21-preamble
> | |(4655) <------------------ (10562) |
> |69,105 | BYE | |SIP Request
> | |(5060) ------------------> (5060) |
> |69,473 | 200 OK | |SIP Status
> | |(5060) <------------------ (5060) |
>
>
> Receiver (Hylafax log):
>
> Jul 31 10:45:54.88: [ 3884]: SESSION BEGIN 000019442 1212
> Jul 31 10:45:54.88: [ 3884]: HylaFAX (tm) Version 5.2.2
> Jul 31 10:45:54.88: [ 3884]: CallID: '' '1217526354.6738' '<NONE>' '21168'
> Jul 31 10:45:54.88: [ 3884]: MODEM set XON/XOFF/FLUSH: input ignored,
> output disabled
> Jul 31 10:45:54.88: [ 3884]: <-- [4:ATA\r]
> Jul 31 10:45:58.60: [ 3884]: --> [7:CONNECT]
> Jul 31 10:45:58.60: [ 3884]: ANSWER: FAX CONNECTION DEVICE '/dev/ttyIAX1'
> Jul 31 10:45:58.60: [ 3884]: STATE CHANGE: ANSWERING -> RECEIVING
> Jul 31 10:45:58.60: [ 3884]: RECV FAX: begin
> Jul 31 10:45:58.60: [ 3884]: <-- HDLC<32:FF C0 04 B5 00 AA 12 9E 36 86
> 62 82 1A 04 14 2E B6 94 04 6A A6 4E CE 96 F6 76 04 AC 74 4C 74 4C>
> Jul 31 10:45:58.60: [ 3884]: <-- data [32]
> Jul 31 10:45:58.60: [ 3884]: <-- data [2]
> Jul 31 10:45:59.56: [ 3884]: --> [7:CONNECT]
> Jul 31 10:45:59.56: [ 3884]: <-- HDLC<23:FF C0 02 B6 A6 26 F6 B6 1A 82
> 92 04 04 04 04 04 04 04 04 04 04 04 04>
> Jul 31 10:45:59.56: [ 3884]: <-- data [23]
> Jul 31 10:45:59.56: [ 3884]: <-- data [2]
> Jul 31 10:46:00.30: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:00.30: [ 3884]: <-- HDLC<13:FF C8 01 00 73 5F 23 01 FB C1 01 01 18>
> Jul 31 10:46:00.30: [ 3884]: <-- data [13]
> Jul 31 10:46:00.30: [ 3884]: <-- data [2]
> Jul 31 10:46:00.88: [ 3884]: --> [2:OK]
> Jul 31 10:46:00.88: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:01.20: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:04.48: [ 3884]: --> [10:NO CARRIER]
> Jul 31 10:46:04.48: [ 3884]: MODEM No carrier
> Jul 31 10:46:04.48: [ 3884]: <-- [10:AT+FRS=21\r]
> Jul 31 10:46:04.68: [ 3884]: --> [2:OK]
> Jul 31 10:46:04.68: [ 3884]: <-- [9:AT+FTH=3\r]
> Jul 31 10:46:04.70: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:04.70: [ 3884]: <-- HDLC<3:FF C8 58>
> Jul 31 10:46:04.70: [ 3884]: <-- data [3]
> Jul 31 10:46:04.70: [ 3884]: <-- data [2]
> Jul 31 10:46:05.78: [ 3884]: --> [2:OK]
> Jul 31 10:46:05.78: [ 3884]: RECV send CRP (command repeat)
> Jul 31 10:46:05.78: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:12.78: [ 3884]: --> [0:]
> Jul 31 10:46:12.78: [ 3884]: MODEM <Empty line>
> Jul 31 10:46:12.78: [ 3884]: MODEM TIMEOUT: waiting for v.21 carrier
> Jul 31 10:46:12.78: [ 3884]: <-- data [1]
> Jul 31 10:46:12.80: [ 3884]: --> [2:OK]
> Jul 31 10:46:12.80: [ 3884]: <-- [9:AT+FRS=7\r]
> Jul 31 10:46:12.82: [ 3884]: --> [2:OK]
> Jul 31 10:46:12.82: [ 3884]: <-- [9:AT+FTH=3\r]
> Jul 31 10:46:12.84: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:12.84: [ 3884]: <-- HDLC<32:FF C0 04 B5 00 AA 12 9E 36 86
> 62 82 1A 04 14 2E B6 94 04 6A A6 4E CE 96 F6 76 04 AC 74 4C 74 4C>
> Jul 31 10:46:12.84: [ 3884]: <-- data [32]
> Jul 31 10:46:12.84: [ 3884]: <-- data [2]
> Jul 31 10:46:14.62: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:14.62: [ 3884]: <-- HDLC<23:FF C0 02 B6 A6 26 F6 B6 1A 82
> 92 04 04 04 04 04 04 04 04 04 04 04 04>
> Jul 31 10:46:14.62: [ 3884]: <-- data [23]
> Jul 31 10:46:14.62: [ 3884]: <-- data [2]
> Jul 31 10:46:15.36: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:15.36: [ 3884]: <-- HDLC<13:FF C8 01 00 73 5F 23 01 FB C1 01 01 18>
> Jul 31 10:46:15.36: [ 3884]: <-- data [13]
> Jul 31 10:46:15.36: [ 3884]: <-- data [2]
> Jul 31 10:46:15.94: [ 3884]: --> [2:OK]
> Jul 31 10:46:15.94: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:17.90: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:19.66: [ 3884]: --> [10:NO CARRIER]
> Jul 31 10:46:19.66: [ 3884]: MODEM No carrier
> Jul 31 10:46:19.66: [ 3884]: <-- [10:AT+FRS=21\r]
> Jul 31 10:46:19.86: [ 3884]: --> [2:OK]
> Jul 31 10:46:19.86: [ 3884]: <-- [9:AT+FTH=3\r]
> Jul 31 10:46:19.88: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:19.88: [ 3884]: <-- HDLC<3:FF C8 58>
> Jul 31 10:46:19.88: [ 3884]: <-- data [3]
> Jul 31 10:46:19.88: [ 3884]: <-- data [2]
> Jul 31 10:46:20.96: [ 3884]: --> [2:OK]
> Jul 31 10:46:20.96: [ 3884]: RECV send CRP (command repeat)
> Jul 31 10:46:20.96: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:27.96: [ 3884]: --> [0:]
> Jul 31 10:46:27.96: [ 3884]: MODEM <Empty line>
> Jul 31 10:46:27.96: [ 3884]: MODEM TIMEOUT: waiting for v.21 carrier
> Jul 31 10:46:27.96: [ 3884]: <-- data [1]
> Jul 31 10:46:27.98: [ 3884]: --> [2:OK]
> Jul 31 10:46:27.98: [ 3884]: <-- [9:AT+FRS=7\r]
> Jul 31 10:46:28.00: [ 3884]: --> [2:OK]
> Jul 31 10:46:28.00: [ 3884]: <-- [9:AT+FTH=3\r]
> Jul 31 10:46:28.02: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:28.02: [ 3884]: <-- HDLC<32:FF C0 04 B5 00 AA 12 9E 36 86
> 62 82 1A 04 14 2E B6 94 04 6A A6 4E CE 96 F6 76 04 AC 74 4C 74 4C>
> Jul 31 10:46:28.02: [ 3884]: <-- data [32]
> Jul 31 10:46:28.02: [ 3884]: <-- data [2]
> Jul 31 10:46:29.80: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:29.80: [ 3884]: <-- HDLC<23:FF C0 02 B6 A6 26 F6 B6 1A 82
> 92 04 04 04 04 04 04 04 04 04 04 04 04>
> Jul 31 10:46:29.80: [ 3884]: <-- data [23]
> Jul 31 10:46:29.80: [ 3884]: <-- data [2]
> Jul 31 10:46:30.54: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:30.54: [ 3884]: <-- HDLC<13:FF C8 01 00 73 5F 23 01 FB C1 01 01 18>
> Jul 31 10:46:30.54: [ 3884]: <-- data [13]
> Jul 31 10:46:30.54: [ 3884]: <-- data [2]
> Jul 31 10:46:31.12: [ 3884]: --> [2:OK]
> Jul 31 10:46:31.12: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:33.06: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:34.84: [ 3884]: --> [10:NO CARRIER]
> Jul 31 10:46:34.84: [ 3884]: MODEM No carrier
> Jul 31 10:46:34.84: [ 3884]: <-- [10:AT+FRS=21\r]
> Jul 31 10:46:35.04: [ 3884]: --> [2:OK]
> Jul 31 10:46:35.04: [ 3884]: <-- [9:AT+FTH=3\r]
> Jul 31 10:46:35.06: [ 3884]: --> [7:CONNECT]
> Jul 31 10:46:35.06: [ 3884]: <-- HDLC<3:FF C8 58>
> Jul 31 10:46:35.06: [ 3884]: <-- data [3]
> Jul 31 10:46:35.06: [ 3884]: <-- data [2]
> Jul 31 10:46:36.14: [ 3884]: --> [2:OK]
> Jul 31 10:46:36.14: [ 3884]: RECV send CRP (command repeat)
> Jul 31 10:46:36.14: [ 3884]: <-- [9:AT+FRH=3\r]
> Jul 31 10:46:43.15: [ 3884]: --> [0:]
> Jul 31 10:46:43.15: [ 3884]: MODEM <Empty line>
> Jul 31 10:46:43.15: [ 3884]: MODEM TIMEOUT: waiting for v.21 carrier
> Jul 31 10:46:43.15: [ 3884]: <-- data [1]
> Jul 31 10:46:43.16: [ 3884]: --> [2:OK]
> Jul 31 10:46:43.16: [ 3884]: RECV FAX: No sender protocol (T.30 T1
> timeout) {E102}
> Jul 31 10:46:43.16: [ 3884]: RECV FAX: end
> Jul 31 10:46:43.16: [ 3884]: No sender protocol (T.30 T1 timeout) {E102}
> Jul 31 10:46:43.16: [ 3884]: SESSION END
>
> Receiver (Wireshark graph):
>
> |Time | 192.168.34.152 | 192.168.32.19 | 192.168.33.10 |
> |0,000 | INVITE SDP ( t38) |
> |SIP From: sip:8001111111-cpy-name-peer-juojuucsegnfc@xxxxxxxxxxxxxx
> To:sip:14151111111@xxxxxxxxxxxxx
> | |(5060) ------------------> (5060) | |
> |0,002 | 100 Trying| |
> |SIP Status
> | |(5060) <------------------ (5060) | |
> |1,977 | 180 Ringing |
> |SIP Status
> | |(5060) <------------------ (5060) | |
> |2,215 | 200 OK SDP ( t38) |
> |SIP Status
> | |(5060) <------------------ (5060) | |
> |2,441 | ACK | |
> |SIP Request
> | |(5060) ------------------> (5060) | |
> |2,714 | ced | |
> |t38:t30 Ind:ced
> | |(10562) <-------------------------------------- (14276) |
> |4,354 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) <-------------------------------------- (14276) |
> |6,912 | CSI Num: IAXmodem |
> |t38:v21:HDLC:Called Subscriber Identification
> | |(10562) <-------------------------------------- (14276) |
> |7,409 | DIS DSR:ITU-T V.27 ter and V.29
> |t38:v21:HDLC:Digital Identification Signal
> | |(10562) <-------------------------------------- (14276) |
> |8,464 | no-signal | |
> |t38:t30 Ind:no-signal
> | |(10562) --------------------------------------> (14276) |
> |11,324 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) <-------------------------------------- (14276) |
> |21,994 | CSI Num: IAXmodem |
> |t38:v21:HDLC:Called Subscriber Identification
> | |(10562) <-------------------------------------- (14276) |
> |26,554 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) <-------------------------------------- (14276) |
> |34,692 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) <-------------------------------------- (14276) |
> |37,217 | CSI Num: IAXmodem |
> |t38:v21:HDLC:Called Subscriber Identification
> | |(10562) <-------------------------------------- (14276) |
> |37,722 | DIS DSR:ITU-T V.27 ter and V.29
> |t38:v21:HDLC:Digital Identification Signal
> | |(10562) <-------------------------------------- (14276) |
> |41,791 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) <-------------------------------------- (14276) |
> |52,061 | v21-preamble |
> |t38:t30 Ind:v21-preamble
> | |(10562) --------------------------------------> (14276) |
> |53,192 | no-signal | |
> |t38:t30 Ind:no-signal
> | |(10562) --------------------------------------> (14276) |
> |54,173 | BYE | |
> |SIP Request
> | |(5060) ------------------> (5060) | |
>
>
--
Atis Lezdins,
VoIP Project Manager / Developer,
atis@xxxxxxxxxxx
Skype: atis.lezdins
Cell Phone: +371 28806004
Cell Phone: +1 800 7300689
Work phone: +1 800 7502835
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- [hylafax-users] T.38 / T.30 handshake problems
- From: Atis Lezdins
- [hylafax-users] T.38 / T.30 handshake problems
- From: Atis Lezdins
- [hylafax-users] T.38 / T.30 handshake problems
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