03-14-2013 03:05 PM - edited 03-16-2019 04:16 PM
Dear Experts
Once again i am in stuck in strange scenario i put real IP on my call manager and successfully register my softphone to the subscriber and also able to make calls to the extension register through the LAN of my company but here no voice in the call either end ..... is any one going through the such scenario before is any one have experience to deal with such kind a of deployments please help its urgent for your reference below is picture.
Call flow in black give me immediate busy tone when i dial any GSM number.
Call flow in Green rings the desire extension but when user pick the call no audio either side .
please help
Hope to listen from you guys sooner
03-18-2013 01:06 PM
Hi,
Try ping from softphone IP to the internal Phone IP both sides, if not pingable, it is the the cause of the silent issue
Also please capture debug isdn Q931 and debug vtsp dsp all from the gw while you are making a call
It seem also connectivity issue between your softphone and the gw IP
Regards
Haitham
03-23-2013 02:54 AM
Hi Hytham
Thanks for yours reply..
Hytham during the analysis i found that when i register the two extensions from the same internet provider its works fine ...... but when i register two extensions from different provider or one extension from inside(behind natting device) and one is on internet the bells ring but again no sound i personally think the issue is routing between two parties as my provider using MPLS tunnells and they assigns private IP to the end user like 10.100.X.X which become the source of audio for softphones and hence the another party not able to route for this address (10.100.X.X).
So after having successfull call when two parties are register through the same provider its sure there is not any dsp resources outage.
Do let me know if you have any confusion.
03-23-2013 04:50 AM
Dear
If your extension is registered , you have firewall and check that the RTP signalling are passed through the ISP and UDP port 2000 is ok check the use ports to allow voice call.
thank you
03-23-2013 05:29 AM
Thanks Mr. Islam
but as i told before i can make call with voice successfully when i register the two extension through the same provider, so its show that provider is not blocking anything but there may be issue in between me and provider.
I just need to know what will be the next step to do further troubleshooting.
Regards
Salman
03-23-2013 10:44 AM
As you told Salman , you now find the problem which i told you before
The issue is you are not able to ping the internal ip add from outside. So no path for rtp traffic between the two end points.
You make successfull call between 2 outside parties cause they both reachable to each other
So you can check natting the internal ips to real and try again and let us know the results
Regards
Haitham
03-23-2013 11:03 AM
Yes Haitham its expected to be like this but i am trying to guess my provider network is he using natting to translate the private within the tunnell to real ip like when on the internet extension i check for the IP assigned by the provider is equal to the private IP like 10.100.X.X but when from same computer i check the assigned IP on web's like whatismyip.com i found its 87.109.X.X some real IP but i cannot ping this IP may be the ICMP block ...???? i try to naattt my traffic but some wierd result come infront let me try again and i will let you know.
by the are you the same Haitham who works in Cisco TAC in present or past ?????
Regards
Salman
03-24-2013 02:25 AM
no
Regards
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