Nick vs Networking

Telco Network Engineering

Tag: DNS

IMS / VoLTE Kamailio Mobile Networks RFCs & Standards VoIP

Kamailio I-CSCF – SRV Lookup Behaviour

Post author By Nick
Post date 10/04/2022
No Comments on Kamailio I-CSCF – SRV Lookup Behaviour

Recently I had a strange issue I thought I’d share. Using Kamailio as an Interrogating-CSCF, Kamailio was getting the S-CSCF details from the User-Authorization-Answer’s “Server-Name” (602) AVP. The value was set to: sip:scscf.mnc001.mcc001.3gppnetwork.org:5060 But the I-CSCF was only looking up A-Records for scscf.mnc001.mcc001.3gppnetwork.org, not using DNS-SRV. The problem? The Server-Name I had configured as a […]

Tags DNS, IMS, Kamailio, VoLTE

IMS / VoLTE Kamailio Mobile Networks VoIP

Kamailio, IMS & DNS Headches

Post author By Nick
Post date 20/02/2022
No Comments on Kamailio, IMS & DNS Headches

IMS DNS Failing

A quick post on a lesson that took me a while to learn with DNS, Kamailio and IMS.

Tags DNS, IMS, Kamailio, Kamailio Bytes, VoIP

ENUM in Practice with Kamailio

Post author By Nick
Post date 26/06/2021
No Comments on ENUM in Practice with Kamailio

Using ENUM to resolve E.164 numbers into SIP URIs using Kamailio.

Tags DNS, ENUM, Kamailio

EPC Mobile Networks RFCs & Standards VoIP

Docker & BIND as an ENUM Playground

Post author By Nick
Post date 06/06/2021
1 Comment on Docker & BIND as an ENUM Playground

A Bind environment in a Docker container for experimenting and learning ENUM for DNS based Call Routing.

Tags Bind, DNS, Docker, ENUM, IMS, VoLTE

IMS / VoLTE Mobile Networks RFCs & Standards SDM VoIP

ENUM – DNS based Call Routing

Post author By Nick
Post date 05/06/2021
No Comments on ENUM – DNS based Call Routing

Using DNS to resolve E.164 phone numbers to routable SIP URIs

Tags DNS, E.164, ENUM