Home > Networking Information and Troubleshooting

Networking Information and Troubleshooting

Bandwidth usage for VoIP

Bandwidth Recommendations

All phones should use the G.711 codec where possible requiring 80 Kbs. The G.729 codec is used as a fall-back and requires 16 Kbs.

These rates are per call and we recommend doubling these numbers when reserving bandwidth. This means that for a single phone you should reserve 160Kbs when using the G.711 codec and 32Kbps when using the G.729 codec.

Other codec’s are available but not currently supported by our systems, their bandwidth requirements will fall somewhere between the two codec’s above.

Quality of service.

Quality of service

The quality of the Voice over IP (VoIP) system is reliant on a good network infrastructure that can transport the voice data and signalling packets reliably and in good time.

  • Lost signalling packets will delay or prevent call setup and may cause extended features, such as call transfer or voice mail, to fail or function poorly.
  • Lost, or delayed, voice packets will cause poor sound quality and in extreme cases no sound at all in one or both directions.

Quality of service (QOS) will help to maintain the delivery of voice data over a given network and we recommend that wherever possible in your network appropriate QOS settings are used to alleviate potential bottlenecks.

  1. VoIP signalling (SIP) traffic is transferred to and from port 5060 on all end-points and servers, these packets should be highest priority and dropped only as a last resort.
    VoIP
    signalling (SIP) packets should be marked with either a diffserv setting of EF,
    ‘type of service’ (TOS) tag of 184, or an IP priority of 5 to ensure they
    are classified and prioritised correctly.
  2. VoIP voice data (RTP) traffic
    should
    be marked with either a diffserv setting of EF, ‘type of service’
    (TOS) tag of 184, or an IP priority of 5 to ensure they are classified and
    prioritised correctly
    is tagged with a ‘type of service’ (TOS)  tag of 184 (priority of 5), these packets should be prioritised over other traffic but may be dropped to allow signalling traffic to be transmitted.
  3. All network equipment must also be set to full-duplex if possible.

Note that Pulsant’s core network is configured to provide QOS for traffic
marked
with either a diffserv setting of EF, ‘type of service’ (TOS) tag of 184, or an
IP priority of 5 to ensure they are classified and prioritised correctly.

Reporting Problems

Please provide the following information to the Support team by calling 0845 119 9999 or email to [email protected] :

Problem details:

  • The specific problem you have, including when it happens and under what circumstances and any other issues?
  • When the problem started happening and for how long it has been going on for?
  • Details of any warnings or error messages you have received?
  • Any issue with the buttons on the phone?

Outgoing call problems:

  • The VoIP phone number you are using?
  • The telephone number you were calling?
  • The error message you got when trying to call them?
  • The date and time that you called the number?

Incoming call problems:

  • Your telephone number?
  • The telephone number of the person that tried to call you?
  • The specific date and time they called?
  • What did the caller hear when they phoned?
  • What did you hear?

Your set up:

  • Telephone type SNOM 190/ELMEG, SNOM 320, X-Lite, X-Pro, Polycom IP331 or another telephone not provided by Pulsant?
  • How are you connected to the internet (connection type and service provider)?

Firewall requirements.

The Pulsant Voice over IP (VoIP) system requires the following firewall ports to be open :-

Port Protocol To/From Used for
5060 UDP 87.246.73.6 SIP
10,000 – 20,000 UDP 87.246.73.6 Voice (RTP)

Reporting Problems

Please provide the following information to the Support team by calling 0845 119 9999 or email to [email protected] :

Problem details:

  • The specific problem you have, including when it happens and under what circumstances and any other issues?
  • When the problem started happening and for how long it has been going on for?
  • Details of any warnings or error messages you have received?
  • Any issue with the buttons on the phone?

Outgoing call problems:

  • The VoIP phone number you are using?
  • The telephone number you were calling?
  • The error message you got when trying to call them?
  • The date and time that you called the number?

Incoming call problems:

  • Your telephone number?
  • The telephone number of the person that tried to call you?
  • The specific date and time they called?
  • What did the caller hear when they phoned?
  • What did you hear?

Your set up:

  • Telephone type SNOM 190/ELMEG, SNOM 320, X-Lite, X-Pro, Polycom IP331 or another telephone not provided by Pulsant?
  • How are you connected to the internet (connection type and service provider)?

DTMF settings.

DTMF Settings

The table below provides a DTMF tone compatibility list for voIP phones against our IVR platform. Please make sure that your phones are configured accordingly in order for subscribers to be able to access our voicemail / IVR services.

Phone Type DTMF Tone Scheme
snom190 Out-of-band (default)
snom320 Out-of-band (default)
X-Pro Out-of-band
CISCO-7912 Out-of-band
CISCO-7940 Out-of-band
Sipura-841 Out-of-band