Hi, my scenary it cucm7.1 - h323 CUBE gateway - SIP TRUNK
i have connected ata 186,the fax fail becouse cisco try to make in passthru but the sip provider SoftX3000 Huawei switch to t38 mode in the invite.
and the ATA cannot work with T38 fax relay.
038350: *Oct 31 21:41:51.662: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received:
INVITE sip:53197010@172.22.24.46:5060 SIP/2.0
Record-Route: <sip:200.13.230.38:5060;ftag=3d60a040;lr=on>
Via: SIP/2.0/UDP 200.13.230.38:5060;branch=z9hG4bK04f3.0577.0
Via: SIP/2.0/UDP 200.30.79.17:5066;branch=z9hG4bKa42133860
Call-ID: FC2BC06C-C59C11DE-9A52A3B6-D1A93BB0@172.22.24.46
From: <sip:3548140@200.13.230.38>;tag=3d60a040
To: <sip:53197010@172.22.24.46>;tag=3F2B9540-1C6A
CSeq: 1 INVITE
Contact: <sip:200.30.79.17:5066>
Max-Forwards: 69
Content-Length: 451
Content-Type: application/sdp
v=0
o=HuaweiSoftX3000 6934792 6934794 IN IP4 200.30.79.17
s=Sip Call
c=IN IP4 200.13.235.188
t=0 0
m=image 61610 udptl t38
a=T38FaxVersion:0
a=T38MaxBitRate:14400
a=T38FaxRateManagement:transferredTCF
a=T38FaxUdpEC:t38UDPRedundancy
m=audio 61712 RTP/AVP 8 0 101
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=ptime:20
a=silenceSupp:off - - - -
a=ecan:fb on -
a=X-fax
a=fmtp:101 0-15
a=nortpproxy:yes
038351: *Oct 31 21:41:51.662: //-1/xxxxxxxxxxxx/SIP/Info/ccsip_new_msg_preprocessor: Checking Invite Dialog
038491: *Oct 31 21:41:51.670: H245 MSC OUTGOING PDU ::=
value MultimediaSystemControlMessage ::= request : requestMode :
{
sequenceNumber 1
requestedModes
{
{
type audioMode : g711Ulaw64k : NULL
}
}
}
038498: *Oct 31 21:41:51.674:
038499: *Oct 31 21:41:51.674: H245 MSC INCOMING PDU ::=
value MultimediaSystemControlMessage ::= response : requestModeReject :
{
sequenceNumber 1
cause requestDenied : NULL
}
----------------------------------
I was investigating about the issue...the ata 186 can work with these fax modes:
• G.711 fax pass-through
• G.711 fax mode
http://www.cisco.com/en/US/prod/collateral/voicesw/ps6788/phones/ps514/ps515/product_data_sheet09186a008007cd72.html
And the sip provider's SoftX3000 Huawei support these fax modes:
Facsimile codec mode
T.38 mode:
Media gateway encodes facsimile signals from a facsimile machine according to the
encoding mode recommended in the T.38 protocol, and encapsulates them in IFP data
packets which will be transmitted in real time on the IP network. The transmission of IFP
data packets is based on either TCP or UDP. In the case of TCP, the TCP provides a
mechanism to guarantee the reliability of the transmission by itself. In the case of UDP,
the T.38 protocol provides a forward error mechanism. Therefore, an outstanding
advantage of the T.38 mode is its high reliability which ensures a high quality of facsimile.
Normal mode
Media gateway encodes facsimile signals sent by a facsimile machine to be voice
codes (such as G.711, G.723, or G.729), and encapsulates them in RTP data packets
which will be transmitted in real time on the IP network. Because the transmission of
RTP data packets is based on UDP only which does not provide a forward error
correction mechanism, facsimile communication in such a normal mode is sensitive to
loss of packets. Once some packets are lost during the transmission, the video at the
receiver may be incomplete or the facsimile may be interrupted.
http://linux.evo.bg/Books/docs.ludost.net/Huawei/Softx3000/SoftX3000 Operation Manual-Configuration Guide.pdf
______________________________________________________________________
So the ata 186 g.711 fax mode its in huawei the normal fax mode, in that case it should be works...
What i have to tell to the provider ???
what its your opinion about the fax mode cisco/huawei ?
any help about the issue ...
