The sca module implements Shared Call Appearances. It handles SUBSCRIBE messages for call-info and line-seize events, and sends call-info NOTIFYs to line subscribers to implement line bridging. The module implements SCA as defined in Broadworks SIP Access Side Extensions Interface Specifications, Release 13.0, version 1, sections 2, 3 and 4. SCA group members receive call state notifications when other group members participate in calls. An SCA caller can place a call on hold, and the call may be retrieved from hold by another member of the group. Subscribers to SCA call-info events SUBSCRIBE to their address-of-record (AoR), asking the application server to send call-info NOTIFYs with line state information as lines in the subscriber group are used. For example, when an SCA subscriber takes the phone off hook, it sends a line-seize SUBSCRIBE to the application server. The application server acknowledges the request, and sends to the subscriber a line-seize NOTIFY with the appearance index of the line claimed for the subscriber. The application also sends call-info NOTIFYs to the other SCA subscribers to the AoR, letting them know that an appearance within the group has gone off hook. Subscribers update their display appropriately. Subscribers to an SCA address-of-record will receive call-info NOTIFYs when a member of the group seizes a line (seized); receives a 180 ringing response from the remote party (ringing); receives a 183 progressing response from the remote party (pr
| Parámetro | Tipo | Descripción |
|---|---|---|
| hash_table_size | integer | 3.2. call_info_max_expires (integer) 3.3. line_seize_max_expires (integer) 3.4. purge_expired_interval (integer) 3.5. db_url (str) 3.6. subs_table (str) 3.7. db_update_interval (integer) 3.8. onhold_b |
| call_info_max_expires | integer | 3.3. line_seize_max_expires (integer) 3.4. purge_expired_interval (integer) 3.5. db_url (str) 3.6. subs_table (str) 3.7. db_update_interval (integer) 3.8. onhold_bflag (integer) 3.9. server_address (s |
| line_seize_max_expires | integer | 3.4. purge_expired_interval (integer) 3.5. db_url (str) 3.6. subs_table (str) 3.7. db_update_interval (integer) 3.8. onhold_bflag (integer) 3.9. server_address (string) 3.10. contact_fallback (string) |
| purge_expired_interval | integer | 3.5. db_url (str) 3.6. subs_table (str) 3.7. db_update_interval (integer) 3.8. onhold_bflag (integer) 3.9. server_address (string) 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_ |
| db_url | str | 3.6. subs_table (str) 3.7. db_update_interval (integer) 3.8. onhold_bflag (integer) 3.9. server_address (string) 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| subs_table | str | 3.7. db_update_interval (integer) 3.8. onhold_bflag (integer) 3.9. server_address (string) 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| db_update_interval | integer | 3.8. onhold_bflag (integer) 3.9. server_address (string) 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| onhold_bflag | integer | 3.9. server_address (string) 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| server_address | string | 3.10. contact_fallback (string) 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| contact_fallback | string | 3.11. from_uri_avp (string) 3.12. to_uri_avp (string) |
| from_uri_avp | string | 3.12. to_uri_avp (string) |
| to_uri_avp | string | 3.1. hash_table_size (integer) |
| hash_table_size | integer | Size, as a power of two, of the shared memory hash table containing the call-info subscriptions and the appearance state. A larger power of two means better performance (fewer collisions, making for f |
| call_info_max_expires | integer | The maximum allowed call-info subscription time in seconds. |
| line_seize_max_expires | integer | The maximum allowed line-seize subscription time in seconds. |
| purge_expired_interval | integer | The period of time in seconds between purges of expired call-info and line-seize subscriptions. |
| db_url | str | URL of database to which subscribers will be written. |
| subs_table | str | Name of the database table where call-info subscriptions are written. |
| db_update_interval | integer | Period in seconds between writes of call-info subscriber information to the database. |
| onhold_bflag | integer | When bflag is set the media will be treated as on-hold and sdp parse will be skipped. If the bflag is not set the sdp will be parsed to detect on-hold. |
| server_address | string | The server address which will become the value of Contact header filed for reply messages. |
| contact_fallback | string | contact used if defined when no contact is found in processed message. |
| from_uri_avp | string | avp that will store the From URI used. |
| to_uri_avp | string | avp that will store the To URI used. |
4.2. sca_call_info_update([mask, to, from])
4.1. sca_handle_subscribe([to_uri, [from_uri]])
The function handling call-info and line-seize SUBSCRIBE requests. It stores or updates the subscriptions in shared memory, and sends NOTIFYs to the subscriber and other members of the group as needed.
* mask - integer (optional) controls what to check as shared line (BOTH, CALLER, CALLEE) + 0 - SCA_CALL_INFO_SHARED_NONE (default) check both + 1 - SCA_CALL_INFO_SHARED_CALLER + 2 - SCA_CALL_INFO_SHARED_CALLEE * to - string (optional) string to use a
Copyright © 2012 Andrew Mortensen, admorten@isc.upenn.edu
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