1. Overview

The following table provides an overview of the functionality of Nconnect Voice and the supported features.

Feature ValueNotes
Calling Line Identification (CLIP) yesCLIP / CLIR needs to be set as specified on the PBX per call; There is no persistent setting on the trunk side
Calling Line Restriction (CLIR) yesCLIP / CLIR needs to be set as specified on the PBX per call; There is no persistent setting on the trunk side
CLIP no screening yesOff by default; Needs to be enabled on customer's request; Customer must have a permission to signal the desired phone number according to national law
DTMF Inband (RTP) & Outband (RFC2833) 
Emergency Calls Based on geographical information of the assigned phone numberIdentified by target number and routed based on geographical location of the associated number block
Fax T.38 & G711 
IP Standard IPv4 
Phone number One geographical number block per trunkNew number blocks or porting of existing numbers are both supported; Verification of location needed according to national law
Registar trunk.cloud-cfg.comPlease always use the FQDN of the registrar with the proper port configuration (trunk.cloud-cfg.com:5060) for setup of the PBX as used IPs might change over time
Security TLS / SRTPTLS / SRTP usage is optional and must be enabled via the PBX configuration; Highly recommended for routing voice traffic through the public internet (WAN)
Supported Codecs G.711a-law (PCMA), G.711u-law (PCMU)Offering additional codecs in the SDP may lead to unexpected behavior on codec negotiation and even rejected calls;
TCP Port 5060 
UDP Port Range 10000 - 60000 

 

The following settings are strongly recommended to be made on the PBX:

  • Disable the transmission of the P-Preferred-Identity Header as these may cause problems in call routing through the public switched telephony network
  • Disable SIP Session Timers as they generate unnecessary traffic and do not provide reliable keep-alive mechanisms