Linksys SPA922, SPA962, SPA942 SDP Payload Types, NAT Support Parameters, SDP Payload Parameters

Setting SIP Parameters

SDP Payload Types

•No UDP Checksum: Select yes if you want the SPA9x2 to calculate the UDP header checksum for SIP messages. Since this involves computation load, you should keep the default value (no) to disable it.

SDP Payload Types

Configured dynamic payloads are used for outbound calls only when the SPA9x2 presents an SDP offer. For inbound calls with an SDP offer, the phone follows the caller’s assigned dynamic payload type.

SPA9x2s use the configured codec names in outbound SDP. For incoming SDP with standard payload types of 0-95, the SPA9x2 ignores the codec names. For dynamic payload types, the SPA9x2 identifies the codec by the configured codec names (comparison is case-sensitive).

SDP Payload Parameters

•INFOREQ Dynamic Payload: This parameter defines the Codec Number used in the SIP messaging for the Dynamic Payload size mechanism. This number should match the number configured in the network/other party to enable the use of Dynamic Payload. The best range is 96-127 for any dynamic payload type.

Defaults to blank.

NAT Support Parameters

Linksys SPA9x2 Phone Administration Guide 52