All termination traffic should be directed to our primary global proxy on outbound.esms.com. That hostname is presently mapped to 194.0.210.200 but will fail over to our secondary global proxy on our secondary site which is 194.0.210.60. We would prefer customers to use the hostname but if you choose to use the IP address you must configure both IP addresses in an active passive form, 194.0.210.200 first, 194.0.210.60 only in the event of it being unavailable. Neither of these IP addresses will respond to pings as ICMP is blocked. For firewall purposes please allow any traffic from 194.0.210.0/24 as RTP will come directly from one of a number of gateways. You should dial in e164 format, i.e. countrycode+areacode+number, e.g. 44203026XXXX. DTMF is as per rfc2833. Caller ID is passed for all routes but only guaranteed on some. It should be passed in e164 format. Privacy should be set in RPID. We support most wide-band/HD and narrow-band codecs as below. You may offer us your preferred codecs in your preferred order on any INVITE and we will attempt to complete based on your highest preference, transcoding where necessary. Naturally, HD calls will only be HD end-to-end where not traversing the PSTN (e.g. Simwood on-net calls and calls to Simwood peers). In these cases audio will be transcoded down to a high quality alternative such as G.711. The table below is in order of our opinion on audio quality for general use although certain codecs in the list have niche applications which may make them more suitable. We particularly recommend the two Broadvoice codecs where customer equipment is compatible, whilst G.711 and G.729A offering most universal support. Naturally, we advise customers that avoiding transcoding along the voice path is more important than codec choice alone.
* G.723.1 may be offered in INVITEs but is not guaranteed to be available. It should therefore always be offered only with another supported codec as an alternative. |
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Outbound SIP |