RightFax-Voice Gateway-ISP all path via SIP

Answered Question
Jan 20th, 2014
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Hi


We have problem with the outgoing calls from right fax to sip provider

Incoming calls working fine


Call flow:


ISP (sip trunk with VG)-----Voice Gateway----Right Fax via SIP


when we try to make outbound calls from right fax to outside fax machine the call disconnected with disconnect code 

SIP/2.0 481 Call Leg/Transaction Does Not Exist


Attached is the debug


A number:

25584000


B Number:

22448511


The outbound call hit the correct outbound dial peer for the sip calls to ISP



dial-peer voice 1000 voip

description **Incoming calls From ISP**

translation-profile incoming RIGHTFAX_INCOMING

modem passthrough nse codec g711alaw

session protocol sipv2

session target sip-server

incoming called-number .

voice-class codec 1 

voice-class sip dtmf-relay force rtp-nte

no voice-class sip outbound-proxy  

dtmf-relay rtp-nte

fax-relay ecm disable

no fax-relay sg3-to-g3

fax rate 9600

fax protocol pass-through g711alaw

no vad

!

dial-peer voice 1001 voip

description **Outgoing calls to ISP**

translation-profile outgoing SIP_Outgoing

destination-pattern 9T

session protocol sipv2

session target sip-server

voice-class codec 1 

voice-class sip dtmf-relay force rtp-nte

dtmf-relay rtp-nte

fax-relay ecm disable

no fax-relay sg3-to-g3

fax rate 9600

fax protocol pass-through g711alaw

no vad



Could you pls help with that/?


Rergards

cc

Correct Answer by MOHIT SINGH about 3 years 6 months ago

Your Right Fax is sending double "m" line in SIP invite. "0" for g711ulaw and "8" for g711alaw.


m=audio 56008 RTP/AVP 0

c=IN IP4 10.10.10.43

a=rtpmap:0 pcmu/8000

m=audio 56008 RTP/AVP 8

c=IN IP4 10.10.10.43

a=rtpmap:8 pcma/8000


With multiple "m" lines in SDP message there will be issue. Enable only one codec in Right fax (either ulaw or a law) and then test again.


If after enabling only one codec you face the same issue the please share the same set of logs + "debug ccsip error". Also share "show run" and "show version"


Regards,

Mohit Singh

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Correct Answer
MOHIT SINGH Mon, 01/20/2014 - 06:36
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Your Right Fax is sending double "m" line in SIP invite. "0" for g711ulaw and "8" for g711alaw.


m=audio 56008 RTP/AVP 0

c=IN IP4 10.10.10.43

a=rtpmap:0 pcmu/8000

m=audio 56008 RTP/AVP 8

c=IN IP4 10.10.10.43

a=rtpmap:8 pcma/8000


With multiple "m" lines in SDP message there will be issue. Enable only one codec in Right fax (either ulaw or a law) and then test again.


If after enabling only one codec you face the same issue the please share the same set of logs + "debug ccsip error". Also share "show run" and "show version"


Regards,

Mohit Singh

MOHIT SINGH Mon, 01/20/2014 - 06:39
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Also try disabling PRACK (or Rel 1XX) in Right fax as the reponse "SIP/2.0 481 Call Leg/Transaction Does Not Exist" is sent for PRACK request.


Sent:

--> SIP/2.0 481 Call Leg/Transaction Does Not Exist

Via: SIP/2.0/UDP 10.10.10.43:5060;branch=z9hG4bK-81e7f-1fb7220b-64261708

From: Intership;tag=9080410-2b0a0a0a-13c4-55013-81e7e-2b9acc30-81e7e

To: ;tag=C1765624-2290

Date: Mon, 20 Jan 2014 13:47:00 GMT

Call-ID: 842af80-2b0a0a0a-13c4-55013-81e7e-421bd972-81e7e

Server: Cisco-SIPGateway/IOS-15.2.4.M4

--> CSeq: 2 PRACK

Content-Length: 0

chrysostomos1980 Mon, 01/20/2014 - 07:46
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Mohit


5 stars to you


The reason for the failure whas the double m line in sip invite

with only the  pcma configured into RTP parametres in RIght fax then the issue solved



Regards
Chrysostomos


""The Most Successful People Are Those Who Are Good At Plan B""

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