Ayodeji Okanlawon, a Cisco Designated VIP, is the Lead Consultant Engineer for Global Solutions Design and Engineering at Verizon Business. In his past, he has worked at Intact IS, NCS Global, and Schlumberger Information Solutions. His experience includes development of design and deployment of large scale IP telephony projects on Cisco Call Manager platforms, Cisco Voice gateways, Cisco Jabber cloud and on premise solution. His expertise includes SIP solutions, CUBE design and Deployment, Troubleshooting: Voice gateways, CUCM, Unity connection, CUPS. Deji has been awarded the Cisco Designated VIP in 2013 and 2014. Deji holds a Bachelor of Science (BS), Electrical and Electronics Engineering, Second Class Upper from Obafemi Awolowo University.
You can download the slides of the presentation in PDF format here. The related Ask The Expert sessions is available here. The complete recording of this live Webcast can be accessed here.
There are several questions that were made during the live Webcast that are answered by Deji in the Ask the Expert Event. Make sure to check the event for more questions.
This implies that Cisco has implemented CUBE to include status code in the reason header field while some other vendors have not. This is normal as it is optional to include it.
Q. What is difference between P-Preferred and P-asserted Field in a INVITE message?
A: P-Preferred-Identity: Is used when a user has multiple Public identities.( e.g. multiple numbers)
NGN servers use the PPID header to identify the preferred number that the caller wants to use. The PPID is part of INVITE messages sent to the NGN. When the NGN receives the PPID, it authorizes
the value, generates a PAID based on the preferred number, and inserts it into the outgoing INVITE message towards the called party.
Your ITSP operates within an NGN network.
Q. Is there a good debug command to determine if the carrier/etc is doing delayed vs early offer.
A: One popular debug you can use here, "debug ccsip messages" for troubleshooting the call failure
Q. I believe CUBE will be replaced by another SBC by Cisco, when is the EOL for Cube.
A: CUBE was under some review to EOL but it's regaining some momentum with the new cloud deployments. Some functionality is being moved to Expressway but the core of CUBE will be available for quite sometime.
Q. I am troubleshooting call drops. The SIP logs and SIP ladders for the dropped calls show that the SIP client is sending BYE messages before the user hangs up the phone. What would cause this? What would cause a SIP client to apparently randomly send a BYE?
A: This could be due to SIP reinvites. Also, a session timer mismatch could cause this.
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