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Cisco Bug: CSCuj23366 - CUBE RTP packets are dropped after FAX re-Invite passthrough call

Last Modified

Apr 25, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

15.1(0.0.4)

Description (partial)

Symptom:
sip provider--sip--CUBE--sip--CUCM8.1--sip‹rightfax(RF)
 
Steps :
1.	RF sends DO INVITE to CUBE . Bothe inleg and outleg rtpnte digit drop configured 
2.	CUBE send EO to ITSP side .
3.	ITSP side responded the call with 183/200OK with  rtp-nte. 
4.	CUCM /RF send ACK with SDP without rtp-nte .
Till this point call working fine with both side audio , but the dtmf interworking triggered and CUBE failed to invoke DSP . But both way audio there 
5.	Now ITSP side FAX passthrough INVITE received and CUBE send passthrough indication to RF .
6.	RF then respond with 200OK without FAX indication and we sent FAX indication to ITSP .
7.	Here whatever packets we received from ITSP dropped .
8.	If we configure only dtmf relay rtp-nte , packets are not dropped .
9.	This flow was working in  20T4 image where same failed on 15.1(4)M6 Image .

Conditions:
dtmf-relay rtpnte digit drop configured
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