Calls from Simwood to customers (i.e. calls received on Simwood DDIs/DIDs mapped to SIP) will originate from one of the following addresses:194.0.210.132
194.0.210.133 194.0.210.50 194.0.210.61 - NEW For firewall purposes please allow any traffic from 194.0.210.0/24. None of the above addresses will respond to PINGs as ICMP is blocked. Any attempt to scan any of these addresses will result in an automatic and unconditional ban of your IP address from the network. Unless configured differently INVITEs will usually be of the form sip:<DDI>@<customer-domain> where <DDI> is the DDI/DID concerned in e164 format, e.g. 44203026XXXX. Incoming CLID will be passed as received and not processed. DTMF is as per rfc2833. Privacy will be set in RPID. We support most wide-band/HD and narrow-band codecs as below. We will offer the below codecs but accept your 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 from Simwood peers). The first position codec in our INVITE will indicate whether end-to-end HD is possible, i.e. if it is a narrowband codec then the call originates from a non-HD source such as the PSTN and whilst HD codecs are offered for convenience audio will be down-sampled. 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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