Jabber MRA one way audio - EXP 12.5.7 CUCM 11.5

[engmouafy]

Hello all,

any thoughts regarding the below ?

Call Setup:

(A)Jabber Mobile/Desktop 

(B)PSTN Mobile Number

(A) --MRA--EXPs --> CUCM --SIPTrunk --> Provider --> (B)

B can hear A but A can't hear B -- if B pressed on any digit during the call, two ways stream start and A can hear B

from EXP-C logs to CUCM if no dtmf pressed:

RTP-RxStat: Dur=35,Pkt=0,Oct=0,LostPkt=0,AvgJit=0,VqMetrics="CS=0;SCS=0"
RTP-TxStat: Dur=35,Pkt=1663,Oct=266080

if jabber is over vpn or onsite the same call goes fine.

MRA Setup:

EXP-E Dual NIC -- Public IP is configured on LAN2 - No NAT

Note: MRA to MRA// MRA to internal - no issues

screen shot from Jabber mobile - Receiving none

[Ayodeji Okanlawon]

Hi,

This looks like a firewall related issue.. I would ask the firewall guys to check why media is being denied. That's where I would start. 

You can also take Wireshark capture on PC and provide the ports that is negotiated for the session to the firewall team. 

[engmouafy]

It is a local ISP issue

[Roger Kallberg]

If you know what the cause is and have solved it would you mind to give a little more details about this for the greater good of the community?