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problem with fax in as5350xm cisco

zeinab.mahdavi
Level 1
Level 1

 

Hello Everybody ,

 

we want relay fax from as5350xm to the sip server. So,I have configured fax(t38 protocol ) on as5350xm gateway and the Sip server ,

Now the signaling is Properly working , but we  couldn't hear or receive fax tone in fax machine, I'm confused that whether gateway must relay a fax tone to fax machine or our sip server ?

the connection establishment is ,first the IVR is played then we click on start button on the fax machine and nothing could be hear  and then the gateway send the invite fax(t38 SDP) to our sip server , also it receive 200 OK(t38 sdp) and response as ack .

I don't know why the data (fax) couldn't transfer .

Furthermore , the packet that we receive on our Sip Server , is the same as below , but we couldn't interpret it. all of the packet are 172 bytes and ,the following 3 packets are the first three packet that we receive in one call and also followed by many other same packet.

are these special t30 packet format that based on ITU ? 

128 - 8 - 198 - 219 - 10 - 173 - 235 - 34 - 9 - 182 - 20 - 85 - 155 - 20 - 6 - 116 - 135 - 157 - 18 - 7 - 201 - 134 - 148 - 24 - 5 - 227 - 129 - 225 - 4 - 24 - 151 - 134 - 198 - 7 - 18 - 156 - 135 - 112 - 6 - 21 - 154 - 133 - 111 - 6 - 100 - 132 - 158 - 17 - 6 - 93 - 134 - 144 - 31 - 4 - 254 - 129 - 232 - 26 - 26 - 233 - 129 - 249 - 4 - 31 - 144 - 135 - 112 - 7 - 78 - 135 - 226 - 4 - 17 - 152 - 159 - 18 - 5 - 235 - 135 - 120 - 7 - 90 - 135 - 225 - 4 - 23 - 155 - 156 - 29 - 26 - 149 - 132 - 100 - 7 - 87 - 135 - 231 - 4 - 20 - 154 - 156 - 28 - 27 - 151 - 132 - 102 - 7 - 220 - 135 - 251 - 4 - 21 - 133 - 146 - 31 - 24 - 150 - 132 - 99 - 6 - 113 - 135 - 159 - 16 - 6 - 210 - 134 - 150 - 25 - 4 - 228 - 129 - 236 - 5 - 27 - 149 - 134 - 241 - 7 - 28 - 146 - 135 - 67 - 6 - 23 - 152 - 132 - 97 - 6 - 99 - 132 - 152 - 20 - 6 - 72 - 135 - 146 - 29 - 7 - 245 - 134 - 148 - 24 - 5 - 226 - 129 - 230 - 4 - 25 - 150 - 134 - 218

/************************************************************************************************/

128 - 8 - 198 - 220 - 10 - 173 - 235 - 194 - 9 - 182 - 20 - 85 - 7 - 19 - 156 - 135 - 114 - 6 - 106 - 154 - 133 - 111 - 6 - 101 - 132 - 158 - 17 - 6 - 81 - 134 - 144 - 31 - 4 - 248 - 129 - 233 - 26 - 26 - 232 - 134 - 255 - 4 - 31 - 144 - 134 - 92 - 6 - 17 - 153 - 132 - 100 - 6 - 108 - 133 - 155 - 21 - 6 - 112 - 135 - 156 - 18 - 7 - 193 - 134 - 151 - 25 - 4 - 225 - 129 - 227 - 5 - 24 - 148 - 134 - 206 - 7 - 29 - 157 - 135 - 116 - 6 - 20 - 155 - 133 - 109 - 6 - 102 - 132 - 153 - 22 - 6 - 69 - 134 - 147 - 28 - 7 - 243 - 134 - 234 - 26 - 5 - 239 - 129 - 229 - 4 - 30 - 145 - 134 - 214 - 6 - 16 - 159 - 132 - 120 - 6 - 104 - 133 - 154 - 107 - 7 - 210 - 135 - 242 - 7 - 104 - 133 - 147 - 30 - 25 - 145 - 132 - 108 - 7 - 244 - 134 - 241 - 7 - 111 - 133 - 144 - 25 - 30 - 144 - 133 - 105 - 7 - 243 - 134 - 207 - 7 - 109 - 132 - 145 - 24 - 30 - 146 - 133 - 106 - 7 - 254 - 135 - 218 - 7 - 96 - 132 - 150 - 27 - 31 - 157 - 154 - 21 - 7

/************************************************************************************************/

128 - 8 - 198 - 220 - 10 - 173 - 235 - 194 - 9 - 182 - 20 - 85 - 7 - 19 - 156 - 135 - 114 - 6 - 106 - 154 - 133 - 111 - 6 - 101 - 132 - 158 - 17 - 6 - 81 - 134 - 144 - 31 - 4 - 248 - 129 - 233 - 26 - 26 - 232 - 134 - 255 - 4 - 31 - 144 - 134 - 92 - 6 - 17 - 153 - 132 - 100 - 6 - 108 - 133 - 155 - 21 - 6 - 112 - 135 - 156 - 18 - 7 - 193 - 134 - 151 - 25 - 4 - 225 - 129 - 227 - 5 - 24 - 148 - 134 - 206 - 7 - 29 - 157 - 135 - 116 - 6 - 20 - 155 - 133 - 109 - 6 - 102 - 132 - 153 - 22 - 6 - 69 - 134 - 147 - 28 - 7 - 243 - 134 - 234 - 26 - 5 - 239 - 129 - 229 - 4 - 30 - 145 - 134 - 214 - 6 - 16 - 159 - 132 - 120 - 6 - 104 - 133 - 154 - 107 - 7 - 210 - 135 - 242 - 7 - 104 - 133 - 147 - 30 - 25 - 145 - 132 - 108 - 7 - 244 - 134 - 241 - 7 - 111 - 133 - 144 - 25 - 30 - 144 - 133 - 105 - 7 - 243 - 134 - 207 - 7 - 109 - 132 - 145 - 24 - 30 - 146 - 133 - 106 - 7 - 254 - 135 - 218 - 7 - 96 - 132 - 150 - 27 - 31 - 157 - 154 - 21 - 7

/************************************************************************************************/

 

16 Replies 16

Hi. The IOS 12.4.9 is a dated IOS (probably 2007).
Can you try a new IOS like 12.4.24T8 or 15.1.4.M8?

Can you add the full wireshark trace?
From image I can't see the packet details.

During a call you can run the command "show call active voice compact" and post the output?

Regards.

----------------------------------show call active voice -----------------------------------

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T25    g711alaw    TELE        P2188827748
     24552 ORG     T25    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T33    g711alaw    TELE        P2188827748
     24552 ORG     T33    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T63    g711alaw    TELE        P2188827748
     24552 ORG     T63    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T65    g711alaw    TELE        P2188827748
     24552 ORG     T65    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T69    g711alaw    TELE        P2188827748
     24552 ORG     T69    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T71    g711alaw    TELE        P2188827748
     24552 ORG     T71    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T73    g711alaw    TELE        P2188827748
     24552 ORG     T73    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T74    g711alaw    TELE        P2188827748
     24552 ORG     T74    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T76    g711alaw    TELE        P2188827748
     24552 ORG     T76    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T80    g711alaw    TELE        P2188827748
     24552 ORG     T80    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T81    g711alaw    TELE        P2188827748
     24552 ORG     T81    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T82    g711alaw    TELE        P2188827748
     24552 ORG     T82    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T83    g711alaw    TELE        P2188827748
     24552 ORG     T83    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T89    g711alaw    TELE        P2188827748
     24552 ORG     T89    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T90    g711alaw    TELE        P2188827748
     24552 ORG     T90    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T94    g711alaw    TELE        P2188827748
     24552 ORG     T94    g711alaw    VOIP        P82131000    217.218.20.86:20052

Cisco#show call active voice compact
 <callID>  A/O FAX T<sec> Codec       type        Peer Address       IP R<ip>:<udp>
Total call-legs: 2
     24550 ANS     T96    g711alaw    TELE        P2188827748
     24552 ORG     T96    g711alaw    VOIP        P82131000    217.218.20.86:20052

----------------------------

In the attachment you can see the wireshark trace of t38 packet 

 

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