SIP General Settings and PBX Compatibility

SIP General Settings and IP PBX Compatibility with VoiceHost

If a PBX is SIP compatible, then it will generally be immediately compatible with our SIP trunks. The most important features for testing the compatibility of a PBX are these:

  • Ability to set registration time at 120 seconds (halves to 60s) where registration is required for inbound calls
  • Ability to enter a username and password for authentication on outgoing calls

If your PBX is not SIP compatible (i.e a legacy PBX), then it may still be compatible with a SIP to PSTN Gateway connected to the PBX, such as those made by Vega/Sangoma. Please call us for confirmation if you plan to connect one to the service.

Protocols and encapsulation

SIP 2.0 (RFC3261 and associated RFCs) for signalling

RTP for media encapsulation

UDP transport (default)

TCP transport (optional)


VoiceHost SIP Trunk Gateways & Firewall Configuration

For FQDN see your VoiceHost control panel.

Firewall configuration: ( - ( - ( - ( -

IP Ports

5060 UDP (SIP signalling)
5061 TCP TLS (SECURE SIP signalling)
10000-65335 UDP (RTP and SRTP stream)

TCP and UDP port 389 (LDAP) and 636 (LDAPS)

Outbound Call Authentication Username/password authentication (default) OR IP authentication
DTMF (Tones)RFC2833 (out-of-band)
Audio CodecsG.711 a-Law, G.711 u-Law, G.722 (HD), GSM 6.10 FR (Full Rate) OPUS Narrowband and OPUS Wideband
Video CodecsH.264/MPEG-4, H.263, H.263+, VP8
Codec Transcoding

Audio - Supported
Video - Not Supported

Incoming number formatsE.164: +countrycode followed by the number, less the leading zero, e.g. +441603904090 (SIP trunk can be configured to strip the plus on the portal)
Outgoing number formatsUK format (e.g. 01603904090) or full E.164 format (e.g. +441603904090).
Voicemail to EmailThe email servers send attachments as a *.wav
Email Server: (


Asterisk based platforms (Confirmed)

  • IP Cortex
  • FreePBX v2
  • TrixBox
  • SARK
  • Asterisk

FreeSWITCH based platforms (Confirmed)

  • FreePBX v3
  • FreeSWITCH

Broadsoft based platforms (Confirmed)

Metaswitch based platforms (Confirmed)

PABX Manufacturers (Confirmed):

  • Panasonic NCP500 and NS1000 (accredited)
  • Mitel 3300 (MCD) (accredited)
  • Mitel 5000
  • Samsung OfficeServ 7000 series (accredited)
  • Avaya IP Office
  • LG iPECS
  • NEC SL1100 and SV8100 (accredited in IP authentication mode)
  • Gigaset PRO T300/500
  • snomONE PBX
  • Cisco UC320 and IOS PBX
  • 3CX Phone System
  • Grandstream PBX
  • iQ PBX
  • Draytek PBX
  • Yeastar S-Series IPPBX (accredited)

SBC Manufacturers (Confirmed)

  • OpenSIPS
  • Kamailio
  • OpenSER
  • ACME Packet
  • Metaswitch
  • Dialogic (IP authentication only)

Incompatible Platforms & Hardware (Cannot be used)

  • Microsoft Lync
  • Skype for business (currently under testing - SEE THE DEVELOPMENT SECTION)
  • NEC XN120
Help Tags: 


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Get in touch

VoiceHost Limited
Norfolk Tower
Surrey Street

UK Freephone 0800 2 545454

International +44 1603904090

support [at]

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