Problem audio with ip phone SIP in internal

[akram.root]

Hello,

I have a cucm version 11 , registred with ip phones SIP (3905-7841-7861-8845).

the problem is : When i do not use the iphone after a great time (Since yesterday and the following day), Once I make the first call it sounds, but

I cannot hear any audio.

After a certain attempt, the problem resolves itself, And I can hear the voice well.

can you help me to reslolve this issue.

is a crtitical please help me.

Best regards

Akram

[Dennis Mink]

Is this for all phone?  and what are you calling? typically this means that IP connectivity to the endpoint you are dialing does not work properly, could be routing, could be arp.

is it to the same IP address you are trying to call, also, include the trace of a failed call and add to post,

PLease rate if this helps.

[akram.root]

Thank you for your reply

This for All ip phones and all ip phones are in the same vlan .

In the first attempt the audio can not hear 

In the call . In the second or third attempt 

The audio of call work  fine .

Can you help me please 

[Jaime Andres Roldan Schmidt]

Hello akram.

To isolate and find out what is causing the issue, you will need to download a call trace.

Refer to this link in order to set up and run the Real Time Monitoring Tool Tool: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/service/7_1_2/rtmt/RTMT/rtinst.html

After RTMT is up and running follow this guide to download the call traces:

http://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/200787-How-to-Collect-Traces-for-CUCM-9-x-10-x.html

We will need the Cisco CallManager traces for now. After you have them, let me know so i can interpret them for you and figure out whats going on. This problem can be many things, and most of them are not even CUCM configuration related.

Kind Regards,

Jaime.

[akram.root]

Hello Jaime

thank you for your reply

when i finished this procedure i come back to you.

Best regards

Akram 

[Jaime Andres Roldan Schmidt]

Hello akram,

In the mean time, i would like to know more information

1) Does this happen on all the phones, or only in one phone?

2) Do you receive the call and hear nothing? Do you make the call and hear nothing? Is there tone when dialing?

3) Is this problem only for external, internal or both type of calls?

4) The phones with the issues are registered via SIP or SCCP?

Best Regards, Jaime.

[akram.root]

Hello,

thank you for your reply and your help

i can answer in your question

1 - for all phones 

2- i can't hear when receive call   -  i can't hear when make call ;

    yes the tone is exist when dialing.

  After a certain attempt, the problem resolves itself, And I can hear the voice well.

3- the problem exist in internal call

4- The phones with the issues are registered via SIP.

On the other hand I share with you the traces of calls concerning the method that you have to share for me (RTMT)

thank you for your help

Best regards

Akram

[Jaime Andres Roldan Schmidt]

Hello akram,

For those traces please let me know the following.

Last 4 digits of the MAC address of the affected phone.

Aproximate time of the call with the problem (for example from 10:12am to 10:20am).

Thank you for the patience.

Kind Regards,

Jaime.

[akram.root]

Hello,

thank you for your reply

the last digits of MAC address of the affected phone: 2BF5

the time of call between (9 am to 10:30am)

thank you for your help

Best regards

Akram

[Jaime Andres Roldan Schmidt]

Hello Akram,

I have finally extracted the call from all the traces (see the attachment and let me know if it's right).

From what i see, the CUCM isn't opening the logical channel to establish the RTP stream with the other phone. I'm not sure why that is, but i will keep reasearching the probable cause.

Best Regards,

Jaime.

[akram.root]

Thank you very much Jaime for your help.

When you will have find the solution let me know

Thank you for your collaboration

Best regards

Akram 

[Jaime Andres Roldan Schmidt]

Hello Akram,

I have been researching and from a CUCM perspective the signaling seems fine.

I would like to do another test to get a better picture of the problem.

Please enable Web Access on 2 of the phones that are having the problem.

To do this go to Device > Phone > Select the Phone > Enable Web Access on the CM Administration Page.

To check if the Web Access is enable, write the IP address from those phones in the browser and the phone page should appear.

At the Bottom Left you should see several links to "Stream 1" "Stream 2", etc.

The second thing to do is to establish a call were no sound is hapenning at all (replicating the issue). Leave that call open (please do not hang up on any of the sides) and check both phones Web Access on Stream 1. Take screenshots of both phones (look at the attached image).

When you have them, let me know.

Best Regards, Jaime.

[akram.root]

Hello Jaime,

many thank for your collaboration and your helps.

when i will fall in this problem i can do the screenshot.

Have a good day

Best regards

Akram

[Jaime Andres Roldan Schmidt]

Hello Akram,

Take your time, i'm here to help you whenever you need.

Regards, Jaime.

[akram.root]

thank you very much Jaime :)