1. Overview

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

FeatureValueNotes
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 screeningyesOff 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
DTMFInband (RTP) & Outband (RFC2833) 
Emergency CallsBased on geographical information of the assigned phone numberIdentified by target number and routed based on geographical location of the associated number block
FaxT.38 & G711 
IP StandardIPv4 
Phone numberOne geographical number block per trunkNew number blocks or porting of existing numbers are both supported; Verification of location needed according to national law
Registartrunk.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
SecurityTLS / 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 CodecsG.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 Port5060 
UDP Port Range10000 - 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
B. Technical Specification2. Phone number formats