Anja schrieb:
Ok du hast mich missverstanden:
CCM Cisco Callmanager 4.0 - läuft auf einem extra Server und unterstützt kein T.38.
CCME Cisco Callmanager Express - läuft auf dem Cisco 1760 und unterstützt natürlich FoIP.
...
ich glaub Du hast mich missverstanden.
der Call Manager muss nie T.38 unterstützen. Das machen die Voice Gateways.....
T.38 Fax Relay
Transporting real-time Group 3 fax documents over internet protocol (IP) uses the International Telecommunications Union Telecommunication Standardization Sector (ITU-T) recommendation T.38 Fax Relay. The T.38 standard defines the IP network protocol that Internet-aware T.38 fax devices and T.38 IP fax gateways use. The T.38 Fax Relay for VoIP H.323 feature provides standards-based, fax relay protocol support for Cisco and other vendor gateways.
The T.38 Fax Relay feature provides a standards-based, fax relay protocol that is available on several Cisco gateways. Because the T.38 Fax Relay protocol is standards based, Cisco gateways and gatekeepers can interoperate with third-party T.38 enabled gateways and gatekeepers in a mixed vendor network that requires real-time fax relay capabilities.
Cisco CallManager handles the T.38 fax call by using a voice connection. When the originating gateway sends a fax, the gateway establishes an initial voice call. The terminating gateway detects the fax tone that the answering fax machine generates. The VoIP H.323 call stack then starts a T.38 mode request by using H.245 procedures. If the opposite end of the call acknowledges the T.38 mode request, the initial audio channel closes, and T.38 Fax Relay channel opens. When the fax transmission finishes, the call disconnects.
Anja schrieb:
Für die Cisco Phones und Cisco simmulierenden Softphones kannst du ephones einrichten auf dem Cisco Callmanager Express. Dazu erstmal per TFTP die Konfigurationsfiles der Phones auf den Router laden und dann entweder zu Fuss konfigurieren oder mit dem im Router integrierten Telephony-service loslegen. Ich weiß nur nicht mehr ab welcher IOS Version der Service unterstützt wird.
Router>en
Router#conf t
Router<config>#telephony-service setup
...
es wurde damals als ITS entwickelt. Eigentlich gibt es eine abgespeckte Version vom Callmanager Express schon lang um Cisco Survivable Remote Site Telephony machen zu können.
Hier eine kleine Beschreibung:
Cisco offers enterprises of all sizes with a cost effective, reliable solution for providing continuous IP Telephony services to branch offices using Cisco Survivable Remote Site Telephony (SRST). A unique, industry-first capability embedded in Cisco IOS Software running on Cisco routers, Cisco SRST provides feature-rich call processing redundancy for centralized CallManager deployments, while leveraging the existing network infrastructure at the remote office. If the WAN link to the remote office fails and the connection to the Cisco CallManager is lost, the branch office phones are automatically redirected to the Cisco SRST branch router, which takes over and provides a core/critical subset of the functions provided by Cisco CallManager -- minimizing the impact to the business. Once the disrupted WAN link is restored, the phones automatically reregister with the original Cisco CallManager -- no manual intervention is required. Cisco SRST is accomplished through an integrated system approach with no additional hardware components and is currently available for Cisco 175x, 1760, 2600, 2800, 3700, 3800 and 7200 Series Routers.
Key benefits offered by Cisco SRST include:
Centralized IP Telephony configuration and management
Access at every site to Cisco CallManager features such as setting up and breaking down calls
Intelligent and automatic failover configuration with no manual IT or Telecom intervention required
Cost-effective operations through converged voice and data network
Remote maintenance and troubleshooting
