Medias Mediatrix 1204, Reference Manual

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DNS SRV Record Lock Reference Manual (SIP Version)
Mediatrix 1204 147
DNS SRV Record Lock
You can configure the Mediatrix 1204 to always use the same DNS SRV record for a SIP call ID. As a result,
a call or registration always uses the same destination until the destination is unreachable or the unit receives
a different DNS SRV result.
X
To enable the DNS SRV record lock feature:
1. In the sipInteropMIB , set the sipInteropLockDnsSrvRecordPerCallEnable variable to enable .
All messages during a call or registration use the same SRV record.
If you set this variable to disable (which is the default value), the Mediatrix 1204 rather follows the
behaviour as described in RFC 3263.
2. Restart the Mediatrix 1204 so that the changes may take effect.
DNS SRV-Oriented Settings
The following parameters have an effect on the DNS SRV behaviour.
Table 93: DNS SRV-Oriented Settings
Parameter Description
sipInteropTransmissionTimeout • Has a dramatic effect should a server time out, since a
default 32 s delay would be introduced at every call.
• Mediatrix recommends a maximum of 2-3 s when using
DNS SRV.
• See “Transmission Timeout” on page 230 for more details.
sipPenaltyBoxTime If sipPenaltyBoxEnable is set to enable :
• A “timed out” server is considered “not responding” for this
amount of time.
• Can be seen as the time it will take to retry a server that
failed responding.
• See “SIP Penalty Box” on page 226 for more details.
sipInteropReuseCredentialEnable If sipInteropReuseCredentialEnable is set to enable :
• If there is not a shared database between servers, this
could lead to authentication problems because a
REGISTER and an INVITE can be sent to any server, not
necessarily the same one.
• See “SIP Credential” on page 233 for more details.