ACTIVE Call disconnects within 1 minute UC500

[Mohamed Shameer Fareed]

Hi

I installed a new UC500 last week. Incoming and Outbound calls disconnect between 40-60 seconds after answering.

I attached the Debug ccsip all. can you let me know the problem

CME 8.6

IOS : uc500-advipservicesk9-mz.151-4.M4b

Phones 7942

PSTN -->> SIP --->> UC540

Test Scenario

23:47PM called 02074022082 (customer sip number) from mobile 079 call cut off after 50 seconds

[paolo bevilacqua · Accepted solution]

Disconnection comes from ITSP, ask them why.

Als you shoudl fix the registration failures.

[Mohamed Shameer Fareed]

Hi Paolo

Thank you verymuch for the prompt reply

Can you be more specific about the problem.

and point me the part on debug where you see the problem was,

When you say ITSP, I beleive you mentioned the VOIP service provider (SIP Trunk from- 'voiceflex') not the Broadband provider (ADSL line from 'BT').

so i can send THEM and ask them to check.

Thank you once again

Regards

shameer

[paolo bevilacqua]

BYE is coming from ITSP.

[Mohamed Shameer Fareed]

Thanks Paolo

I'll check with them tomorrow and revert.

Thanks

Shameer

[Ayodeji Okanlawon · Accepted solution]

Mohammed,

Before you speak to your provider you should sort some things out at your end...

When you send a registration request to your provider...Your registration expire timer is set to 2 minutes..

REGISTER sip:93.95.124.78:5060 SIP/2.0

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE1D1E74

From: <84420051>;tag=B0FFE6C-1C3A

To: <84420051>

Date: Sat, 09 Mar 2013 23:44:33 GMT

Call-ID: A49AD962-86FE11E2-800DE0C7-CFC70E28

User-Agent: Cisco-SIPGateway/IOS-12.x

Max-Forwards: 70

Timestamp: 1362872673

CSeq: 2958 REGISTER

Contact: <84420051>

Expires:  120------------------------------------------------------------After 2 minutes this regiustration expires

Now after 2 minutes you send another regutsration request to your provider.. (23:46 in the trace)

To fix this I suggest you increase your registration timer so that during calls your timer doesnt expire and cause issues..

Now lets look at this issue ( I think its related to your registration too)

1. At 23:46.04 you received an invite...call connects at 23:46:09 the call was connected

2. at 23:46.10 a new registration request was sent..pay attention to this section, this is where thing are breaking

Sent:

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE1F756
REGISTER sip:93.95.124.78:5060 SIP/2.0

---

CSeq: 2960 REGISTER----------------------------------Nb the seq number

Next your provider sends an authentication request for he REGISTER

Received:
SIP/2.0 401 Unauthorized

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE1F756;received=212.188.195.234

From: <84420051>;tag=B11768C-70F

CSeq: 2960 REGISTER

User-Agent: VoiceFlex

Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO

Supported: replaces

WWW-Authenticate: Digest algorithm=MD5, realm="voiceflex", nonce="051dabc0"

+++ Next your gateway sends a new request without the authorization credentials.....

Sent:
REGISTER sip:93.95.124.78:5060 SIP/2.0

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE1F756 (the via header shows us its the old transaction)

CSeq: 2960 REGISTER---------------------------------------------------------------- This is wrong...

Contact: <84420051>

Expires:  120

NB: This new request is sent with the old CSEQ number..2960...Now that is not right. This transaction is dead..So your ITSP ignores it and we dont get any response...then the gateway sends a new one

Sent:

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE2055B
REGISTER sip:93.95.124.78:5060 SIP/2.0

CSeq: 2961 REGISTER

Authorization: Digest username="84420051",realm="voiceflex",uri="sip:93.95.124.78:5060",response="8f9a435db8481c1dddf13dc61ce44be8",nonce="051dabc0",algorithm=MD5

Now..eventually we get a trying to the old REGISTER with csq 2960

Received:
SIP/2.0 100 Trying

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE1F756;received=212.188.195.234

Call-ID: A49AD962-86FE11E2-800DE0C7-CFC70E28

CSeq: 2960 REGISTER

And we also receive a trying for the REGISTER with cseq 2961

Received:
SIP/2.0 100 Trying

Via: SIP/2.0/UDP 212.188.195.234:5060;branch=z9hG4bKE2055B;received=212.188.195.234

CSeq: 2961 REGISTER

And after this we get a BYE

Received:
BYE sip:02033010433@212.188.195.234:5060 SIP/2.0

Via: SIP/2.0/UDP 93.95.124.78:5060;branch=z9hG4bK66ecac34;rport

From: "07929768214" <07929768214>;tag=as7d8f97b4

To: <02033010433>;tag=B1161CC-109B

Call-ID: 6f9f10136d0394f251b2acb95f226bc5@93.95.124.78

CSeq: 103 BYE

So you can see that your provider seems fedup with incorrect/ un properly formatted regustration requests leading to them tearing down active calls..

Action plan..

Increase your registration timer and test again

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"opportunity is a haughty goddess who waste no time with those who are unprepared"

[Mohamed Shameer Fareed]

Thank you very much for the detailed explanation

I changed the registration expiry to 300 seconds.

it seems to be working but cannot test fully untill tomorrow when the staff started to make/receive calls

update you tomorrow

thank you once again

regards

shameer

[Ayodeji Okanlawon]

300 seconds is too low..Thats five minutes. You can use 3600 or 7200 thats much better..3600 gives you 1hr and 7200 2hrs..I prefer 2hrs..

Please rate all useful posts

"opportunity is a haughty goddess who waste no time with those who are unprepared"

[Mohamed Shameer Fareed]

Thank you very much for the support

Yes Paolo, its provider sending the disconnect, because when customer said the calls are dropping last week, i thought call disconnects, but this morning i found out its not disconnecting but its one way choopy audio (extenal caller experiencing drop on voice but Internal person can hear clearly). so i endedup troubleshooting with my CIPC with VPN while audio disabled. so phone is not sending any RDP so provider is disconnection due to silence. fair enough. when i test with a physical ipphone this morning its fine.

Also there is a issue with registration as well. Provider advised me to enter following commands under sip-ua.

keepalive target ipv4:93.95.124.78 udp

timers keepalive active 15

But customer said they experiencing intermittent voice drop on calls, its always the external caller facing the problem.

i'll try to collect some logs and post here or i''ll open a new thread.

thanks

shameer

[paolo bevilacqua]

Voice drops = network issue. Fix or upgrade you internet connection.