# VoIP

This is where you will find the settings for an audio transmission in the IP network

Table 1. SIP
Display | Description
Signalling port | The standard port for SIP signalling is 5060.
Session refresh timer for active line supervision (s) | The session refresh timer for active line supervision checks, with the session refresh method at regular intervals, whether connection to the remote station is still active. If the remote station does not react within the period defined here (in seconds), the connection is cut.
Internal registration timeout (hours) | The registration time for all SIP clients (other than MMC clients).
Use very long registration time for MMC | The registration time for MMC clients is set to 30 days.

Table 2. RTP settings
Display | Description
Slot |
Card/module |
Slot on card |
Module |
RTP start port | Start of RTP port range
RTP end port | End of RTP port range
Bandwidth control area |

Table 3. NAT
Display | Description
Public NAT gateway address |
SIP public media address | SIP signalling address (RFC3581):

Table 4. IP system phones settings
Display | Description
Signalling port |
Keep alive time (s) |
Registration time expires (s) |
Administrator password (also valid for Mitel SIP phones) | Here you can set the local password for all connected IP system phones and Mitel SIP phones at the same time. Any passwords already set are then overwritten. You must restart Mitel SIP phones to activate the new password. The password is immediately activated on IP system phones. To assign the passwords locally to the phones, the entry must be blank. A phone first-start has to be carried out to reset the password to the default values. The default administrator password for IP system phones is “0000”. The default administrator password for Mitel SIP phones is “22222”.

Table 5. Fax
Display | Description
Fax detection mode | Select the Receive only setting if the Mitel 400 Fax Service is used as fax server.

Table 6. QoS
Display | Description
Layer 2: Active for | Nodes only: Only use layer 2 settings on the nodes. Nodes and terminals: Use layer 2 settings on the nodes and IP/SIP terminals.
Layer 2: Frame type | Standard (no QoS): Select this setting if the VLAN assignment is made on the switch used based on the port (standard). VLAN/CoS 802.1p/Q): Select this setting for the tagged VLAN assignment of the communication server according to IEEE 802.1/Q, or in order to switch on CoS prioritisation. The VLAN ID is assigned further down.
Layer 2: CoS prioritisation level | Specifies the priority of the voice packets when CoS prioritisation is switched on. Level 5 must be set to ensure good voice quality. 6 Interactive Voice
Layer 2: VLAN-ID | ID of the VLAN to which the communication server should be assigned. Note: If the IP phones are also included in the VLAN (Active for = Nodes and Terminals setting), then the IP phones must be assigned to the same VLAN.
Note: Layer 2 settings are only available due to compatibility with older systems.
Layer 3: DSCP signalling | The values entered in the master are automatically transmitted to the satellites. A low class does not mean a lower prioritization. For FoIP (T.38) the configuration for DSCP class voice is used. Further information on the Layer-3 settings can be found via the hyperlinks in the section See also...
Layer 3: DSCP voice
Layer 3: DSCP video

See also...

"Prioritization and QoS"

"Designing the VoIP channels"

Parent topic: DHCP server
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