Cisco Systems Linksys PAP2, RT31P2 4.6.3. Dynamic Payload Types and SDP Codec Names

FAX CED Detect Enable Enable detection of FAX tone. Bool Yes

FAX CNG Detect

Enable Bool Yes

FAX Passthru Codec Codec to use for fax passthru {G711u,

G711a} G711u

FAX Codec Symmetric Force unit to use symmetric codec during FAX

passthru Bool Yes

FAX Passthru Method Choices: None / NSE / ReINVITE Choice NSE

FAX Process NSE Bool Yes

Release Unused Codec Bool Yes

Notes:

1. A codec resource is considered as allocated if it has been included in the SDP codec list of an

active call, even though it eventually may not be the one chosen for the connection. So, if the G.729a

codec is enabled and included in the codec list, that resource is tied up until the end of the call

whether or not the call actually uses G.729a. If the G729a resource is already allocated and since

only one G.729a resource is allowed per PHONE ADAPTER, no other low-bit-rate codec may be

allocated for subsequent calls; the only choices are G711a and G711u. On the other hand, two

G.723.1/G.726 resources are available per PHONE ADAPTER. Therefore it is important to disable

the use of G.729a in order to guarantee the support of 2 simultaneous G.723/G.726 codec.

4.6.3. Dynamic Payload Types and SDP Codec Names

Note: You should only need to change the payload type mappings if you are interworking with a non-

standard implementation.

Parameter Name Description Type Default

NSE Dynamic Payload1,2 NSE dynamic payload type Uns8 100

AVT Dynamic Payload1,2 AVT dynamic payload type Uns8 101

G726r16 Dynamic Payload1,2 G726-16 dynamic payload type Uns8 98

G726r24 Dynamic Payload1,2 G726-24 dynamic payload type Uns8 97

G726r40 Dynamic Payload1,2 G726-40 dynamic payload type Uns8 96

G729b Dynamic Payload1,2 G729b dynamic payload type Uns8 99

Notes:

1. Valid range is 96 – 127

2. The configured dynamic payloads are used for outbound calls only where the PHONE ADAPTER

presents the SDP offer. For inbound calls with a SDP offer, PHONE ADAPTER will follow the caller’s

dynamic payload type assignments

Parameter Name Description Type Default

NSE Codec Name NSE Codec name used in SDP Str31 NSE

AVT Codec Name AVT Codec name used in SDP Str31 telephone-event

G711a Codec Name G711a Codec name used in SDP Str31 PCMA

G711u Codec Name G711u Codec name used in SDP Str31 PCMU

G726r16 Codec Name G726-16 Codec name used in SDP Str31 G726-16

G726r24 Codec Name G726-24 Codec name used in SDP Str31 G726-24

G726r32 Codec Name G726-32 Codec name used in SDP Str31 G726-32