24 V6100 and V7122 User GuideV7122 FeaturesThis section provides a high-level overview of some of the many V7122 supported features.General Features Compliant with SIP (RFC 3261). Supported coders: G.711 A-law, G.711 μ-law, G.723.1, G.726, G.729, NetCoder,EVRC*, AMR*, Transparent, GSM Full-Rate, Microsoft GSM and GSM EFR*.* When EVRC (Enhanced Variable Rate Codec), AMR (Adaptive Multi-Rate) and GSMEFR are used, the number of available gateway channels is reduced (see the Mediant &TP Series SIP Digital Gateways Release Notes). Note that AMR, EVRC and GSM EFRaren’t supported on the V6100. Supports negotiation of dynamic payload types. Supports reception and DNS resolution of FQDNs received in SDP. T.38 fax with superior performance (handling a round-trip delay of up to nine seconds). Echo Canceler (with up to 128 msec tail length), Jitter Buffer, Voice Activity Detection(VAD) and Comfort Noise Generation (CNG) support. Silence suppression with Comfort Noise Generation. Web management for easy configuration and installation. EMS for comprehensive management operations (FCAPS). Simple Network Management Protocol (SNMP) and Syslog support. SMDI support for Voice Mail applications (V7122 only). ThroughPacket™ proprietary feature that aggregates payloads from several channelsinto a single IP packet to reduce bandwidth overhead. Supports load balancing with proxy. Can be integrated into a Multiple IPs and a VLAN-aware environment. Capable of automatically updating its firmware version and configuration. Secured Web access (HTTPS) and Telnet access using SSL / TLS. IPSec and IKE protocols are used in conjunction to provide security for control (e.g., SIP)and management (e.g., SNMP and Web) protocols. Secured RTP (SRTP) according to RFC 3711, used to encrypt RTP and RTCP transport.PSTN-to-SIP InterworkingThe V7122 gateway performs interworking between ISDN and CAS via E1/T1/J1 digitalspans and SIP IETF signaling protocol. 16 E1, T1 or J1 spans are supported (480 channels)in a two modules gateway.
